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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
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.