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
9 Months Ended
Sep. 30, 2014
Operating Leased Assets [Line Items]  
2014 $ 16,929
2015 65,416
2016 64,689
2017 64,103
2018 64,403
Tenant Improvements [Member]
 
Operating Leased Assets [Line Items]  
2014 53
2015 1,000
2016   
2017   
2018   
2019   
Thereafter   
Tenant Improvements [Member] | Burnsville, MN [Member]
 
Operating Leased Assets [Line Items]  
Lease End Date 2023-01
2014 53
2015 1,000
2016   
2017   
2018   
2019   
Thereafter