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, 2019
Dec. 31, 2018
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost $ 14,588 $ 11,734
Accumulated depreciation and amortization (8,569) (8,298)
Furniture, equipment and leasehold improvements, net 6,019 3,436
Leasehold Improvements    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost 7,688 5,229
Furniture and Equipment    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost 6,409 6,022
Artwork    
Property Plant And Equipment Useful Life And Values [Abstract]    
Total cost $ 491 $ 483