Quarterly report pursuant to sections 13 or 15(d)

Furniture, Equipment and Leasehold Improvements, Net - Summary of Furniture, Equipment and Leasehold Improvements, Net (Detail)

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Furniture, Equipment and Leasehold Improvements, Net - Summary of Furniture, Equipment and Leasehold Improvements, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2006
Property Plant And Equipment Useful Life And Values [Abstract]        
Leasehold improvements $ 3,559 $ 3,557 $ 3,284 $ 513
Furniture and equipment 3,595 3,526    
Artwork 341 338    
Total cost 7,495 7,421    
Accumulated depreciation and amortization (5,660) (5,360)    
Furniture, equipment and leasehold improvements, net $ 1,835 $ 2,061