Income Taxes - Summary of Provision for Income Taxes and U.S. Federal Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed “expected” tax expense				$ 225,022	$ 187,601	$ 179,530
Change in valuation allowance				11,952	20,243	(53)
Foreign income tax differential				(25,533)	(23,718)	(24,972)
State taxes net of federal benefits				9,439	6,711	4,492
Foreign-sourced nontaxable income				(7,961)	(10,573)	(8,128)
IRC Section 199 deduction				(7,731)	(10,221)	0
Excess tax benefits related to stock-based compensation				(11,974)	0	0
Other				(2,680)	3,530	(6,633)
Total provision	$ 46,095	$ 45,822	$ 91,917	$ 190,534	$ 173,573	$ 144,236
Computed "expected" tax expense, rate				35.00%	35.00%	35.00%
Change in valuation allowance, rate				1.90%	3.80%	0.00%
Foreign income tax differential, rate				4.00%	4.40%	4.90%
State taxes net of federal benefits, rate				1.50%	1.20%	0.90%
Foreign-sourced nontaxable income, rate				(1.20%)	(2.00%)	(1.60%)
IRC Section 199 deduction, rate				(1.20%)	(1.90%)	(0.00%)
Excess tax benefits related to stock-based compensation, rate				(1.90%)	0.00%	0.00%
Other, rate				(0.40%)	0.70%	(1.30%)
Provision for income taxes, rate				29.70%	32.40%	28.10%