XML 89 R75.htm IDEA: XBRL DOCUMENT v3.20.4
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, 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.