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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income taxes computed at the statutory U.S. federal income tax rate | $ 52,949 | $ 61,543 | $ 83,884
State income taxes, net of federal tax benefit | 7,133 | 6,326 | 4,529
Tax liabilities (no longer required) required | (2,002) | 1,908 | 1,254
Valuation allowance | 1,699 | 240 | 4,636
Manufacturing exemption | 0 | 0 | (5,143)
Tax credit refunds, net | (3,493) | (3,415) | (2,797)
Foreign earnings taxed at other than 21%, 21% and 35%, respectively | 3,741 | 7,851 | (3,840)
Deferred tax rate changes | 92 | (1,947) | (114,163)
Other | (1,797) | (3,199) | 1,662
Provision (benefit) for income taxes | $ 58,322 | $ 69,307 | $ (29,978)
Effective tax rate | 23.10% | 23.60% | (12.50%)

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