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Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock Outstanding (Detail)
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Unvested PSUs, RSUs and restricted stock outstanding, beginning balance | shares 1,846
Number of Shares, PSUs, RSUs and restricted stock granted | shares 359
Number of Shares, PSUs, RSUs and restricted stock vested | shares (21)
Number of Shares, PSUs, RSUs and restricted stock forfeited | shares (65)
Number of Shares, Unvested PSUs, RSUs and restricted stock outstanding, ending balance | shares 2,119
Weighted Avg. Grant Date Fair Value, Unvested PSUs, RSUs and restricted stock outstanding, Beginning Balance | $ / shares $ 11.49
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock granted | $ / shares 16.75
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock vested | $ / shares 13.00
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock forfeited | $ / shares 11.93
Weighted Avg. Grant Date Fair Value, Unvested PSUs, RSUs and restricted stock outstanding, Ending Balance | $ / shares $ 12.40