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Income Taxes - Variation of Provision for Income Taxes from Statutory U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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%

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