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
6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 918,379
Granted 275,347
Vested (200,043)
Transferred 0
Forfeited/canceled (20,061)
Nonvested shares at ending 973,622
Unrecognized stock-based compensation expense as of June 30, 2021 | $ $ 30,454
Weighted average remaining vesting period (years) as of June 30, 2021 3 years 6 months 18 days
Nonvested weighted average grant date fair value per share, beginning balance | $ / shares $ 33.73
Weighted average grant date fair value per share, Granted | $ / shares 38.57
Weighted average grant date fair value per share, Vested | $ / shares 32.31
Weighted average grant date fair value per share, Transferred | $ / shares 31.05
Weighted average grant date fair value per share, Forfeited/canceled | $ / shares 33.05
Nonvested weighted average grant date fair value per share, ending balance | $ / shares $ 34.86
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
Granted 12,492
Vested (16,728)
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 12,492
Unrecognized stock-based compensation expense as of June 30, 2021 | $ $ 378
Weighted average remaining vesting period (years) as of June 30, 2021 10 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
Granted 247,469
Vested (155,379)
Transferred (3,220)
Forfeited/canceled (16,476)
Nonvested shares at ending 710,044
Unrecognized stock-based compensation expense as of June 30, 2021 | $ $ 23,442
Weighted average remaining vesting period (years) as of June 30, 2021 3 years 9 months
Restricted Stock Units [Member] | Independent Contractors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 264,001
Granted 15,386
Vested (27,936)
Transferred 3,220
Forfeited/canceled (3,585)
Nonvested shares at ending 251,086
Unrecognized stock-based compensation expense as of June 30, 2021 | $ $ 6,634
Weighted average remaining vesting period (years) as of June 30, 2021 2 years 11 months 26 days