Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal
Current	$ 95,046	$ 93,345	$ 104,224
Deferred	17,631	(6,023)	(19,811)
Federal income tax expense, total	112,677	87,322	84,413
State
Current	16,973	17,093	17,715
Deferred	368	(553)	(1,164)
State and local income tax expense, total	17,341	16,540	16,551
Foreign
Current	147,174	127,567	121,621
Deferred	0	0	0
Foreign income tax expense, total	147,174	127,567	121,621
Total
Current	259,193	238,005	243,560
Deferred	17,999	(6,576)	(20,975)
Income tax expense	$ 277,192	$ 231,429	$ 222,585