Income Taxes (Detail) - Components of Income Tax Expenses - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense:
U.S. federal	$ 48,801	$ 49,281	$ 20,215
State and local	10,300	5,135	4,928
Foreign	23,225	16,653	17,167
Total current	82,326	71,069	42,310
Deferred tax (benefit) expense:
U.S. federal	(884)	(6,670)	18,824
State and local	(702)	6,477	2,742
Foreign	1,550	779	(4,688)
Total deferred	(36)	586	16,878
Income tax expense (benefit) before other	82,290	71,655	59,188
Income tax expense (benefit)	96,576	90,917	83,638
Benefit (expense) relating to interest rate swaps used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	893	(1,442)	(1,405)
Benefit from stock transactions with employees used to increase equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	13,960	18,704	25,373
Benefit (expense) relating to defined-benefit pension adjustments used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	$ (567)	$ 2,000	$ 482