Income Taxes - Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income taxes computed at the statutory U.S. federal income tax rate	$ 61,543	$ 83,884	$ 81,171
State income taxes, net of federal tax benefit	6,326	4,529	4,264
Tax liabilities required (no longer required)	1,908	1,254	(408)
Valuation allowance	240	4,636	474
Manufacturing exemption	0	(5,143)	(3,613)
Tax credit refunds, net	(3,415)	(2,797)	(2,676)
Foreign earnings taxed at other than 21%, 35% and 35%, respectively	7,851	(3,840)	(2,334)
Deferred tax rate changes	(1,947)	(114,163)	(371)
Other	(3,199)	1,662	2,059
Provision (benefit) for income taxes	$ 69,307	$ (29,978)	$ 78,566
Effective tax rate	23.60%	(12.50%)	33.90%