Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leased Assets [Line Items]      
Expenses incurred for the properties listed $ 0.4 $ 0.4 $ 0.2
Ground Leases [Member]
     
Operating Leased Assets [Line Items]      
Number of leases 3