Income Taxes (Detail) - Components of Income Tax Expenses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense:
U.S. federal	$ 49,281	$ 20,215	$ 25,270
State and local	5,135	4,928	2,508
Foreign	16,653	17,167	18,822
Total current	71,069	42,310	46,600
Deferred tax (benefit) expense:
U.S. federal	(6,670)	18,824	8,379
State and local	6,477	2,742	(770)
Foreign	779	(4,688)	(7,797)
Total deferred	586	16,878	(188)
Income tax expense (benefit) before other	71,655	59,188	46,412
Income tax expense (benefit)	90,917	83,638	69,693
Benefit (expense) relating to interest rate swap used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	(1,442)	(1,405)	51
Benefit from stock transactions with employees used to increase equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	18,704	25,373	21,304
Benefit (expense) relating to defined-benefit pension adjustments used to increase (decrease) equity
Deferred tax (benefit) expense:
Other tax expense (benefit)	$ 2,000	$ 482	$ 1,926