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Computed Amount and Differences in Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Pretax income | $ 392,345 | $ 392,440 | $ 353,129
Computed amount at statutory rate of 35% | 137,321 | 137,354 | 123,595
State and local income tax (net of federal tax benefit) | 5,033 | 4,875 | 4,382
Taxes on non-U.S. earnings-net of foreign tax credits | (11,663) | (9,378) | (9,683)
Effect of flow-through entities | (8,358) | (9,018) | (7,267)
U.S. business tax credits | (1,273) | (1,680) | (1,516)
Domestic activities production deduction | (6,521) | (7,489) | (6,217)
Effective Income Tax Rate Reconciliation, Deferred tax effect of foreign tax rate change | (2,636) | 0 | 0
Other | (2,365) | (1,610) | (5,380)
Total provision for income taxes | $ 109,538 | $ 113,054 | $ 97,914

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