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Income Taxes - Summary of Variations Between the Effective and Statutory U.S. Federal Income Tax Rates (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax provision at statutory tax rate |  | $ 36,000 | $ 26,437 | $ 33,471
State tax provision on income less applicable federal tax benefit |  | 867 | 926 | 353
Foreign income taxed at different rates | [1] | (5,060) | (5,416) | (2,474)
Unrecognized tax benefits | [1] | 1,536 | 241 | (53)
Domestic production activities deduction |  | (884) | (312) | (991)
Nontaxable foreign interest income |  | (2,106) | (2,435) | (2,614)
Nontaxable biodiesel excise credit income |  |  | (130) | (2,347)
U.S. tax credits |  | (3,465) | (1,086) | (2,209)
Non-deductible expenses and other items, net | [1] | (69) | 229 | 157
Total |  | $ 26,819 | $ 18,454 | $ 23,293
Percentage of Federal income tax provision at statutory tax rate |  | 35.00% | 35.00% | 35.00%
Percentage of State tax provision on income less applicable federal tax benefit |  | 0.80% | 1.20% | 0.40%
Percentage of Foreign income taxed at different rates | [1] | (4.90%) | (7.20%) | (2.60%)
Percentage of Unrecognized tax benefits | [1] | 1.50% | 0.30% | (0.10%)
Percentage of Domestic production activities deduction |  | (0.90%) | (0.40%) | (1.00%)
Percentage of Nontaxable foreign interest income |  | (2.00%) | (3.20%) | (2.70%)
Percentage of Nontaxable biodiesel excise credit income |  |  | (0.20%) | (2.50%)
Percentage of U.S. tax credits |  | (3.40%) | (1.40%) | (2.30%)
Percentage of Non-deductible expenses and other items, net | [1] | 0.00% | 0.30% | 0.20%
Percentage of Total income tax provision |  | 26.10% | 24.40% | 24.40%
[1] | Certain 2014 and 2013 amounts have been reclassified to conform to the current year presentation.

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