Quarterly report pursuant to Section 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
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost $ 10,609 $ 11,109
Accumulated depreciation and amortization (8,118) (8,656)
Furniture, equipment and leasehold improvements, net 2,491 2,453
Leasehold Improvements    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost 4,089 4,034
Furniture and Equipment    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost 6,039 6,607
Artwork    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost $ 481 $ 468