Quarterly report pursuant to sections 13 or 15(d)

Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail)

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Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Property Plant And Equipment Useful Life And Values [Abstract]        
Depreciation expense $ 100 $ 299 $ 128 $ 359