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
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 800,075
Granted 409,262
Vested (268,659)
Transferred 0
Forfeited/canceled (24,034)
Nonvested shares at ending 916,644
Unrecognized stock-based compensation expense as of September 30, 2020 | $ $ 27,219
Weighted average remaining vesting period (years) as of September 30, 2020 3 years 6 months 29 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 32.88
Weighted average grant date fair value per share, Vested | $ / shares 33.08
Weighted average grant date fair value per share, Transferred | $ / shares 33.67
Weighted average grant date fair value per share, Forfeited/canceled | $ / shares 34.84
Nonvested weighted average grant date fair value per share, ending balance | $ / shares $ 33.67
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 (20,268)
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 16,728
Unrecognized stock-based compensation expense as of September 30, 2020 | $ $ 266
Weighted average remaining vesting period (years) as of September 30, 2020 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 525,115
Granted 306,008
Vested (164,091)
Transferred (18,294)
Forfeited/canceled (16,804)
Nonvested shares at ending 631,934
Unrecognized stock-based compensation expense as of September 30, 2020 | $ $ 18,779
Weighted average remaining vesting period (years) as of September 30, 2020 3 years 8 months 26 days
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 83,738
Vested (84,300)
Transferred 18,294
Forfeited/canceled (7,230)
Nonvested shares at ending 267,982
Unrecognized stock-based compensation expense as of September 30, 2020 | $ $ 8,174
Weighted average remaining vesting period (years) as of September 30, 2020 3 years 3 months 21 days