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Summary of Significant Accounting Policies - Common Stock and Convertible Stock Dilutive in Computation of Earning Per Share (Detail) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Weighted average PSUs | 929 | 632 | 776
Weighted average grant date fair value per unit | $ 8.11 | $ 9.33 | $ 9.56
Weighted average convertible preferred stock | 43,750 | 63,832 | 44,565

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