Other Assets, Net - Components of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fixed Assets:
Leasehold improvements	$ 52,798	$ 54,257
Computer hardware and software	47,361	48,178
Furniture, fixtures and equipment	8,411	8,373
Accumulated depreciation and amortization	(73,730)	(67,558)
Fixed assets, net	34,840	43,250
Goodwill	22,691	22,691
Prepaid expenses	18,507	11,629
Other	6,570	4,833
Total Other Assets, Net	$ 82,608	$ 82,403