Income Taxes - Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. statutory tax rate	35.00%	35.00%
State and local taxes, net of federal benefit	4.90%	6.20%
Rate change impact on deferred taxes	(1.40%)	6.90%
Tax benefit arrangement liability adjustment		(2.10%)
Foreign tax rate differential	(0.30%)	0.30%
Withholding taxes and other		0.20%
Reserve for uncertain tax position	3.10%
Income attributable to non-controlling interests	(20.50%)	(27.10%)
Effective tax rate	20.80%	19.40%