Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail)

v3.21.2
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 918,379 [1]
Granted 363,532
Vested (258,454)
Transferred 0
Forfeited/canceled (31,815)
Nonvested shares at ending 991,642 [1]
Unrecognized stock-based compensation expense as of September 30, 2021 | $ $ 30,854 [2]
Weighted average remaining vesting period (years) as of September 30, 2021 3 years 6 months 10 days
Nonvested weighted average grant date fair value per share, beginning balance | $ / shares $ 33.73 [1]
Weighted average grant date fair value per share, Granted | $ / shares 38.74
Weighted average grant date fair value per share, Vested | $ / shares 31.93
Weighted average grant date fair value per share, Transferred | $ / shares 34.49
Weighted average grant date fair value per share, Forfeited/canceled | $ / shares 33.06
Nonvested weighted average grant date fair value per share, ending balance | $ / shares $ 35.52 [1]
Restricted Stock Awards [Member] | Non-Employee Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 16,728 [1]
Granted 12,492
Vested (16,728)
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 12,492 [1]
Unrecognized stock-based compensation expense as of September 30, 2021 | $ $ 265 [2]
Weighted average remaining vesting period (years) as of September 30, 2021 7 months 2 days
Restricted Stock Units [Member] | Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 637,650 [1]
Granted 269,474
Vested (163,758)
Transferred (9,057)
Forfeited/canceled (25,470)
Nonvested shares at ending 708,839 [1]
Unrecognized stock-based compensation expense as of September 30, 2021 | $ $ 22,090 [2]
Weighted average remaining vesting period (years) as of September 30, 2021 3 years 7 months 6 days
Restricted Stock Units [Member] | Independent Contractors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 264,001 [1]
Granted 81,566
Vested (77,968)
Transferred 9,057
Forfeited/canceled (6,345)
Nonvested shares at ending 270,311 [1]
Unrecognized stock-based compensation expense as of September 30, 2021 | $ $ 8,499 [2]
Weighted average remaining vesting period (years) as of September 30, 2021 3 years 5 months 8 days
[1] Nonvested RSUs will be settled through the issuance of new shares of common stock.
[2] The total unrecognized compensation expense is expected to be recognized over a weighted-average period of approximately 3.53 years.