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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax provision at statutory tax rate |  | $ 35,924 | $ 26,439 | $ 28,931
State income tax provision, less applicable federal tax benefit | [1] | 2,956 | 367 | 3,094
Foreign income taxed at different rates |  | 1,964 | 623 | 864
U.S. taxation of foreign earnings | [2] | 4,134 | 2,349 | 2,348
Unrecognized tax benefits |  | 1,454 | 2,954 | (460)
Nontaxable foreign interest income |  |  |  | (1,179)
U.S. tax reform, net impact | [3] |  |  | (375)
Change in accounting methods | [4] |  |  | (3,383)
Prior years return to provision true-up |  | (588) | (1,740) | (508)
Stock based compensation, excess tax benefits |  | (1,816) | (1,633) | (1,648)
U.S. tax credits | [5] | (1,831) | (6,412) | (1,324)
Non-deductible expenses and other items, net |  | 1,214 | (149) | 304
Total |  | $ 43,411 | $ 22,798 | $ 26,664
Percentage of Federal income tax provision at statutory tax rate |  | 21.00% | 21.00% | 21.00%
Percentage of state income tax provision, less applicable federal tax benefit | [1] | 1.70% | 0.30% | 2.20%
Percentage of Foreign income taxed at different rates |  | 1.10% | 0.50% | 0.60%
Percentage of U.S. taxation of foreign earnings | [2] | 2.40% | 1.90% | 1.70%
Percentage of Unrecognized tax benefits |  | 0.80% | 2.30% | (0.30%)
Percentage of Nontaxable foreign interest income |  |  |  | (0.90%)
Percentage of U.S. tax reform, net impact | [3] |  |  | (0.30%)
Percentage of Change in accounting methods | [4] |  |  | (2.50%)
Percentage of Prior years return to provision true-up |  | (0.30%) | (1.40%) | (0.40%)
Percentage of stock based compensation, excess tax benefits |  | (1.10%) | (1.30%) | (1.20%)
Percentage of U.S. tax credits | [5] | (1.10%) | (5.10%) | (1.00%)
Non-deductible expenses and other items, net |  | 0.90% | (0.10%) | 0.50%
Percentage of Total income tax provision |  | 25.40% | 18.10% | 19.40%
[1] | For 2019, amount includes incremental state research credits for the tax years 2015 - 2019 that were identified as part of a research and development tax credit study.
[2] | Includes cost of global intangible low-taxed income (GILTI) in 2020, 2019 and 2018 plus other taxes paid or withheld on cash repatriated from foreign countries in 2020, 2019 and 2018.
[3] | Does not include state tax impacts, which are included in state income tax provision, less applicable federal tax benefit.
[4] | For 2018, amount represents the federal tax rate change due to certain accounting methods that were adopted on the 2017 federal income tax return.
[5] | For 2019, amount includes incremental federal research credits for 2015 - 2019 that were identified as part of a research and development tax credit study. Also includes a federal tax rate change due to the classification of certain 2016 and 2017 depreciable fixed assets as deductible research costs.

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