Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 800,075
Granted 334,082
Vested (215,483)
Transferred 0
Forfeited/canceled (14,449)
Nonvested shares at ending 904,225
Unrecognized stock-based compensation expense as of June 30, 2020 | $ $ 27,851
Weighted average remaining vesting period (years) as of June 30, 2020 3 years 8 months 4 days
Nonvested weighted average grant date fair value per share, beginning balance | $ / shares $ 33.91
Weighted average grant date fair value per share, Granted | $ / shares 34.25
Weighted average grant date fair value per share, Vested | $ / shares 32.48
Weighted average grant date fair value per share, Transferred | $ / shares 33.37
Weighted average grant date fair value per share, Forfeited/canceled | $ / shares 36.16
Nonvested weighted average grant date fair value per share, ending balance | $ / shares $ 34.35
Restricted Stock Awards [Member] | Non-Employee Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 17,480
Granted 19,516
Vested (18,004)
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 18,992
Unrecognized stock-based compensation expense as of June 30, 2020 | $ $ 386
Weighted average remaining vesting period (years) as of June 30, 2020 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 525,115
Granted 282,104
Vested (158,007)
Transferred (19,059)
Forfeited/canceled (12,874)
Nonvested shares at ending 617,279
Unrecognized stock-based compensation expense as of June 30, 2020 | $ $ 19,687
Weighted average remaining vesting period (years) as of June 30, 2020 3 years 11 months 1 day
Restricted Stock Units [Member] | Independent Contractors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 257,480
Granted 32,462
Vested (39,472)
Transferred 19,059
Forfeited/canceled (1,575)
Nonvested shares at ending 267,954
Unrecognized stock-based compensation expense as of June 30, 2020 | $ $ 7,778
Weighted average remaining vesting period (years) as of June 30, 2020 3 years 2 months 12 days