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) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Leased Assets [Line Items]    
Expenses incurred for the properties listed $ 0.1 $ 0.1
Ground Leases [Member]
   
Operating Leased Assets [Line Items]    
Number of leases 3