Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Future Tenant Improvement Payments Due on Properties (Detail)

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Commitments and Contingencies - Future Tenant Improvement Payments Due on Properties (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Operating Leased Assets [Line Items]  
2014 $ 34,255
2015 63,228
2016 62,763
2017 61,125
2018 61,469
Tenant Improvements [Member]
 
Operating Leased Assets [Line Items]  
2014 1,685
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Canton, NC [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2024-07
2014 1,306
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Concord Township, OH [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2034-08
2014 150
2015   
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Egg Harbor Township, NJ [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2023-04
2014 229
2015   
2016   
2017   
2018   
2019   
Thereafter