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Income Tax - Schedule of effective tax rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory U.S. rate | 21.00% | 21.00% | 21.00%
State tax, net of federal tax benefit | (2.60%) | (1.10%) | 2.20%
Foreign tax, net of federal tax benefit | 1.10% | (17.40%) | (0.40%)
Goodwill impairment |  |  | (10.40%)
Global Intangible Low Taxed Income |  | (8.30%) | (0.20%)
Transaction expenses | (0.10%) | (5.40%) | (0.10%)
Disallowed Executive Compensation | (3.40%) |  |
Equity-based compensation | (11.20%) | (1.50%) | 0.20%
Meals and entertainment | (0.70%) | (11.10%) | (0.20%)
Contingent consideration fair value adjustment | (1.40%) | 7.10% | 0.70%
Non-deductible expenses | (0.40%) | (4.60%) |
Return to provision on permanent differences | 0.10% | 8.20% | 0.10%
Work opportunity tax credit | 0.50% | 3.30% |
Research and development credit | 0.30% | 4.00% |
Other |  | 0.00% | (0.10%)
Effective tax rate | 3.20% | (7.40%) | 12.80%

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