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Income Taxes - Reconciliation of the Federal Statutory Tax Rate to Total Provisions (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Taxes computed at statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit | (3.36%) | 3.16% | 2.52% |
Federal research credit | (0.79%) | (0.34%) | (0.14%) |
Equity in losses of foreign joint venture | 0.64% | 0.19% | 0.08% |
Impairment on investment in foreign joint venture | 11.20% |  |  |
Tax loss on investment in foreign joint venture | (22.73%) |  |  |
Foreign rate differential | 1.15% |  | (0.07%) |
Noncontrolling interests | (2.88%) | (1.18%) | (0.78%) |
Tax Reform Act |  |  | 0.18% |
CARES Act NOL carryback | (5.77%) |  |  |
Other, net | 1.49% | 0.27% | 0.38% |
Provision for income taxes | (0.06%) | 23.10% | 23.17% |

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