Income Taxes (Detail) - Components of Income Tax Expenses - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax expense:
U.S. federal	$ 58,616	$ 48,801	$ 49,281
State and local	11,292	10,300	5,135
Foreign	27,536	23,225	16,653
Total current	97,444	82,326	71,069
Deferred tax (benefit) expense:
U.S. federal	(61)	(884)	(6,670)
State and local	(349)	(702)	6,477
Foreign	(1,626)	1,550	779
Total deferred	(2,036)	(36)	586
Total current and deferred	95,408	82,290	71,655
Total tax expense	94,849	96,576	90,917
Benefit (expense) relating to interest rate swaps used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax benefit (expense)	(1,113)	893	(1,442)
Benefit from stock transactions with employees used to increase equity
Deferred tax (benefit) expense:
Other tax benefit (expense)	52	13,960	18,704
Benefit (expense) relating to defined-benefit pension adjustments used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax benefit (expense)	$ 502	$ (567)	$ 2,000