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Income Taxes - Summary of Actual Income Tax Expense and Amount Calculated Utilizing U.S. Federal Statutory Rates (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Tax expense at federal statutory rate									$ 16,360	$ 25,633	$ 36,103
Non-controlling interest									73	3,466	(3,544)
Incremental impact of foreign taxes compared to federal tax rate									(476)	7,935	2,739
Other permanent differences									5,337	3,397	6,051
U.S. state and local taxes, net of U.S. federal benefit									(321)	(2,650)	(539)
New York City UBT									(3,256)	(392)	(514)
Other rate changes									(12,783)	10,509	4,024
Revaluation of deferred taxes related to tax reform											4,776
Uncertain tax positions									1,475	(1,025)	2,764
U.S. tax on foreign earnings, net of tax credits									2,643	3,166	2,163
Return-to-provision adjustments									1,076	(3,937)	2,598
Valuation allowance									11,966	4,015	2,567
Other									(791)	(306)	4,580
Provision for income taxes	$ (6,729)	$ 8,558	$ 8,599	$ 10,875	$ 4,075	$ 6,691	$ 13,261	$ 25,784	$ 21,303	$ 49,811	$ 63,768

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