Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v2.4.0.8
Commitments and Contingencies - Additional Information (Detail) (Ground Leases [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Lease
Sep. 30, 2012
Ground Leases [Member]
   
Operating Leased Assets [Line Items]    
Number of leases 3  
Expenses incurred for the properties listed $ 0.3 $ 0.3