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Income Taxes - Summary of Provision for Income Taxes and U.S. Federal Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Computed "expected" tax expense, amount | $ 187,601 | $ 179,530 | $ 141,249
Change in valuation allowance, amount | 20,243 | (53) | (222)
Foreign income tax differential, amount | (23,718) | (24,972) | (16,021)
State taxes net of federal benefits, amount | 6,711 | 4,492 | 4,744
Foreign-sourced nontaxable income, amount | (10,573) | (8,128) | (11,967)
IRC Section 199 deduction, amount | (10,221) |  |
Other, amount | 3,530 | (6,633) | 1,285
Provision for income taxes, amount | $ 173,573 | $ 144,236 | $ 119,068
Computed "expected" tax expense, rate | 35.00% | 35.00% | 35.00%
Change in valuation allowance, rate | 3.80% |  |
Foreign income tax differential, rate | (4.40%) | (4.90%) | (4.00%)
State taxes net of federal benefits, rate | 1.20% | 0.90% | 1.20%
Foreign-sourced nontaxable income, rate | (2.00%) | (1.60%) | (3.00%)
IRC Section 199 deduction, rate | (1.90%) |  |
Other, rate | 0.70% | (1.30%) | 0.30%
Provision for income taxes, rate | 32.40% | 28.10% | 29.50%

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