Other Assets, Net - Components of Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fixed Assets:
Leasehold improvements	$ 52,798	$ 52,798
Computer hardware and software	47,755	47,361
Furniture, fixtures and equipment	8,411	8,411
Accumulated depreciation and amortization	(75,531)	(73,730)
Fixed assets, net	33,433	34,840
Goodwill	22,691	22,691
Prepaid expenses	17,955	18,507
Other	5,183	6,570
Total Other Assets, Net	$ 79,262	$ 82,608