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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax provision at statutory tax rate |  | $ 48,733 | $ 39,836 | $ 36,000
State tax provision on income less applicable federal tax benefit |  | 1,271 | 716 | 867
Foreign income taxed at different rates |  | (8,075) | (6,325) | (5,060)
Repatriation of foreign earnings |  | (1,054) | 14 | 21
Unrecognized tax benefits |  | (47) | 23 | 1,536
Domestic production activities deduction |  | (1,339) | (1,633) | (884)
Nontaxable foreign interest income |  | (2,073) | (2,030) | (2,106)
U.S. tax reform, net impact | [1] | 14,807 |  |
Change in accounting method for depreciation |  | (893) |  |
Stock based compensation, excess tax benefits | [2] | (2,254) | (1,878) |
U.S. tax credits |  | (1,204) | (1,100) | (3,465)
Non-deductible expenses and other items, net | [3] | (182) | (5) | (90)
Total |  | $ 47,690 | $ 27,618 | $ 26,819
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 |  | 0.90% | 0.60% | 0.80%
Percentage of Foreign income taxed at different rates |  | (5.80%) | (5.60%) | (4.90%)
Percentage of foreign earnings |  | (0.80%) |  |
Percentage of Unrecognized tax benefits |  | 0.00% |  | 1.50%
Percentage of Domestic production activities deduction |  | (1.00%) | (1.40%) | (0.90%)
Percentage of Nontaxable foreign interest income |  | (1.50%) | (1.80%) | (2.00%)
Percentage of U.S. tax reform, net impact | [1] | 10.70% |  |
Percentage of Change in accounting method for depreciation |  | (0.60%) |  |
Percentage of stock based compensation, excess tax benefits | [2] | (1.60%) | (1.70%) |
Percentage of U.S. tax credits |  | (0.90%) | (1.00%) | (3.40%)
Percentage of Non-deductible expenses and other items, net | [3] | (0.10%) | 0.20% |
Percentage of Total income tax provision |  | 34.30% | 24.30% | 26.10%
[1] | Does not include state tax impacts, which are included in state tax provision on income less applicable federal tax benefit.
[2] | Excess tax benefits related to employee share-based payment transactions recognized in 2017 and 2016 resulting from the adoption of ASU No. 2016-9. There is no effect for 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, which was 2016.
[3] | Certain 2016 and 2015 amounts have been reclassified to conform to the current year presentation.

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