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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax provision at statutory tax rate |  | $ 39,836 | $ 36,000 | $ 26,437
State tax provision on income less applicable federal tax benefit |  | 716 | 867 | 926
Foreign income taxed at different rates |  | (6,325) | (5,060) | (5,416)
Unrecognized tax benefits |  | 23 | 1,536 | 241
Domestic production activities deduction |  | (1,633) | (884) | (312)
Nontaxable foreign interest income |  | (2,030) | (2,106) | (2,435)
Stock based compensation, excess tax benefits | [1] | (1,878) |  |
U.S. tax credits |  | (1,100) | (3,465) | (1,086)
Non-deductible expenses and other items, net | [2] | 9 | (69) | 99
Total |  | $ 27,618 | $ 26,819 | $ 18,454
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 |  | 0.60% | 0.80% | 1.20%
Percentage of Foreign income taxed at different rates |  | (5.60%) | (4.90%) | (7.20%)
Percentage of Unrecognized tax benefits |  | 0.00% | 1.50% | 0.30%
Percentage of Domestic production activities deduction |  | (1.40%) | (0.90%) | (0.40%)
Percentage of Nontaxable foreign interest income |  | (1.80%) | (2.00%) | (3.20%)
Percentage of stock based compensation, excess tax benefits | [1] | (1.70%) |  |
Percentage of U.S. tax credits |  | (1.00%) | (3.40%) | (1.40%)
Percentage of Non-deductible expenses and other items, net | [2] | 0.20% | 0.00% | 0.10%
Percentage of Total income tax provision |  | 24.30% | 26.10% | 24.40%
[1] | Excess tax benefits related to employee share-based payment transactions recognized in 2016 resulting from early adoption of ASU No. 2016-9, as described in Note 1. There is no effect for 2014 and 2015 because the recognition of excess tax benefits in the tax provision is to be done only on a prospective basis, beginning with the year of adopting the new guidance.
[2] | Certain 2014 amounts have been reclassified to conform to the current year presentation.

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