Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Properties Acquired (Detail)

v3.5.0.2
Real Estate and Intangible Assets - Summary of Properties Acquired (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
ft²
option
property
Jun. 30, 2015
USD ($)
ft²
option
property
Jul. 25, 2014
ft²
Business Acquisition [Line Items]      
Number of properties acquired | property   4  
Square Footage (unaudited) | ft²   351,276 81,371
Renewal Options | option   2  
Renewal Options Period   5 years  
Total Purchase Price   $ 58,248  
Acquisition Expenses   404  
Annualized GAAP Rent   6,089  
Debt Issued & Assumed $ 9,900 $ 32,039  
Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Number of properties acquired | property 1    
Acquisition Date May 26, 2016 May 29, 2015  
Square Footage (unaudited) | ft² 107,000 86,409  
Lease Term 6 years 6 years 6 months  
Renewal Options | option   1  
Renewal Options Period   5 years  
Total Purchase Price $ 17,000 $ 22,200  
Acquisition Expenses 109 144  
Annualized GAAP Rent 1,393 2,411  
Debt Issued & Assumed   $ 13,000  
Richardson, TX [Member]      
Business Acquisition [Line Items]      
Acquisition Date   Mar. 06, 2015  
Square Footage (unaudited) | ft²   155,984  
Lease Term   9 years 6 months  
Renewal Options | option   2  
Renewal Options Period   5 years  
Total Purchase Price   $ 24,700  
Acquisition Expenses   112  
Annualized GAAP Rent   2,708  
Debt Issued & Assumed   $ 14,573  
Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Acquisition Date   Mar. 20, 2015  
Square Footage (unaudited) | ft²   30,850  
Lease Term   8 years 6 months  
Renewal Options | option   1  
Renewal Options Period   5 years  
Total Purchase Price   $ 3,648  
Acquisition Expenses   76  
Annualized GAAP Rent   $ 333  
Columbus, OH [Member]      
Business Acquisition [Line Items]      
Acquisition Date   May 28, 2015  
Square Footage (unaudited) | ft²   78,033  
Lease Term   15 years  
Renewal Options | option   2  
Renewal Options Period   5 years  
Total Purchase Price   $ 7,700  
Acquisition Expenses   72  
Annualized GAAP Rent   637  
Debt Issued & Assumed   4,466  
Leasing Costs [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (3,603)  
Leasing Costs [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (337) (981)  
Leasing Costs [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,804)  
Leasing Costs [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (146)  
Leasing Costs [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (672)  
In-Place Leases [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (6,058)  
In-Place Leases [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (1,352) (2,396)  
In-Place Leases [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (2,060)  
In-Place Leases [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (458)  
In-Place Leases [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,144)  
Tenant Improvement [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (5,947)  
Tenant Improvement [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (1,685) (1,268)  
Tenant Improvement [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (2,781)  
Tenant Improvement [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (351)  
Tenant Improvement [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,547)  
Building [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (29,646)  
Building [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (8,973) (11,861)  
Building [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (12,591)  
Building [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,683)  
Building [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (3,511)  
Land [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (7,964)  
Land [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (3,008) (3,248)  
Land [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (2,728)  
Land [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (650)  
Land [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,338)  
Above Market Leases [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,628)  
Above Market Leases [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (821)  
Above Market Leases [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (807)  
Above Market Leases [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   0  
Above Market Leases [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   0  
Below Market Leases [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired (30) (1,132)  
Below Market Leases [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (53)  
Below Market Leases [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   0  
Below Market Leases [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   0  
Below Market Leases [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,079)  
Customer Relationships [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (4,534)  
Customer Relationships [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired $ (1,675) (1,678)  
Customer Relationships [Member] | Richardson, TX [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (1,929)  
Customer Relationships [Member] | Birmingham, AL [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   (360)  
Customer Relationships [Member] | Columbus, OH [Member]      
Business Acquisition [Line Items]      
Fair Value of Assets Acquired   $ (567)  
Maximum [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Renewal Options Period 3 years    
Minimum [Member] | Salt Lake City UT [Member]      
Business Acquisition [Line Items]      
Renewal Options | option 2    
Renewal Options Period 2 years