Quarterly report pursuant to Section 13 or 15(d)

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

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Commitments and Contingencies - Future Tenant Improvement Payments Due on Properties (Parenthetical) (Detail) (Tenant Improvements [Member])
6 Months Ended
Jun. 30, 2014
Tenant Improvements [Member]
 
Operating Leased Assets [Line Items]  
Extended lease period 20 years
Lease expiration year 2034-09
Projected completion period of property expansion 2034-09