Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 918,379
Granted 227,727
Vested (149,117)
Transferred 0
Forfeited/canceled (20,061)
Nonvested shares at ending 976,928
Unrecognized stock-based compensation expense as of March 31, 2021 | $ $ 31,378
Weighted average remaining vesting period (years) as of March 31, 2021 3 years 8 months 19 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 39.10
Weighted average grant date fair value per share, Vested | $ / shares 33.01
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 $ 34.56
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 0
Vested 0
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 16,728
Unrecognized stock-based compensation expense as of March 31, 2021 | $ $ 42
Weighted average remaining vesting period (years) as of March 31, 2021 1 month 6 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 217,893
Vested (132,176)
Transferred (3,220)
Forfeited/canceled (16,476)
Nonvested shares at ending 703,671
Unrecognized stock-based compensation expense as of March 31, 2021 | $ $ 24,124
Weighted average remaining vesting period (years) as of March 31, 2021 3 years 10 months 28 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
Granted 9,834
Vested (16,941)
Transferred 3,220
Forfeited/canceled (3,585)
Nonvested shares at ending 256,529
Unrecognized stock-based compensation expense as of March 31, 2021 | $ $ 7,212
Weighted average remaining vesting period (years) as of March 31, 2021 3 years 1 month 2 days