Quarterly report pursuant to Section 13 or 15(d)

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

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Real Estate and Intangible Assets - Summary of Properties Acquired (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
ft²
Option
Jun. 30, 2014
USD ($)
ft²
Option
Business Acquisition [Line Items]    
Square Footage (unaudited) | ft² 351,276 1,194,759
Total Purchase Price $ 58,248 $ 74,911
Acquisition Expenses 391 924
Annualized GAAP Rent 6,089 7,218
Debt Issued & Assumed $ 32,039 $ 37,681
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 104  
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 71  
Annualized GAAP Rent $ 333  
Allen, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Mar. 27, 2014
Square Footage (unaudited) | ft²   21,154
Lease Term   12 years
Renewal Options | Option   4
Renewal Options Period   5 years
Total Purchase Price   $ 5,525
Acquisition Expenses   29
Annualized GAAP Rent   570
Debt Issued & Assumed   $ 3,481
Colleyville, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Mar. 27, 2014
Square Footage (unaudited) | ft²   20,355
Lease Term   12 years
Renewal Options | Option   4
Renewal Options Period   5 years
Total Purchase Price   $ 4,523
Acquisition Expenses   29
Annualized GAAP Rent   467
Debt Issued & Assumed   $ 2,849
Rancho Cordova, CA [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Apr. 22, 2014
Square Footage (unaudited) | ft²   61,358
Lease Term   10 years
Renewal Options | Option   1
Renewal Options Period   5 years
Total Purchase Price   $ 8,225
Acquisition Expenses   65
Annualized GAAP Rent   902
Debt Issued & Assumed   $ 4,935
Coppell, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   May 08, 2014
Square Footage (unaudited) | ft²   21,171
Lease Term   12 years
Renewal Options | Option   4
Renewal Options Period   5 years
Total Purchase Price   $ 5,838
Acquisition Expenses   22
Annualized GAAP Rent   601
Debt Issued & Assumed   $ 3,816
Columbus, OH [Member]    
Business Acquisition [Line Items]    
Acquisition Date May 28, 2015 May 13, 2014
Square Footage (unaudited) | ft² 78,033 114,786
Lease Term 15 years 9 years 6 months
Renewal Options | Option 2  
Renewal Options Period 5 years  
Total Purchase Price $ 7,700 $ 11,800
Acquisition Expenses 72 65
Annualized GAAP Rent 637 $ 1,278
Debt Issued & Assumed $ 4,466  
Taylor, PA [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Jun. 09, 2014
Square Footage (unaudited) | ft²   955,935
Lease Term   10 years
Renewal Options | Option   4
Renewal Options Period   5 years
Total Purchase Price   $ 39,000
Acquisition Expenses   714
Annualized GAAP Rent   3,400
Debt Issued & Assumed   $ 22,600
Salt Lake City, UT [Member]    
Business Acquisition [Line Items]    
Acquisition Date May 29, 2015  
Square Footage (unaudited) | ft² 86,409  
Lease Term 6 years 6 months  
Renewal Options | Option 1  
Renewal Options Period 5 years  
Total Purchase Price $ 22,200  
Acquisition Expenses 144  
Annualized GAAP Rent 2,411  
Debt Issued & Assumed $ 13,000