Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 800,075
Granted 249,699
Vested (170,106)
Transferred 0
Forfeited/canceled (8,310)
Nonvested shares at ending 871,358
Unrecognized stock-based compensation expense as of March 31, 2020 | $ $ 28,285
Weighted average remaining vesting period (years) as of March 31, 2020 3 years 9 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 36.74
Weighted average grant date fair value per share, Vested | $ / shares 31.75
Weighted average grant date fair value per share, Transferred | $ / shares 32.26
Weighted average grant date fair value per share, Forfeited/canceled | $ / shares 38.19
Nonvested weighted average grant date fair value per share, ending balance | $ / shares $ 35.10
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 0
Vested 0
Transferred 0
Forfeited/canceled 0
Nonvested shares at ending 17,480
Unrecognized stock-based compensation expense as of March 31, 2020 | $ $ 74
Weighted average remaining vesting period (years) as of March 31, 2020 2 months 1 day
Restricted Stock Units [Member] | Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares at beginning 525,115
Granted 229,315
Vested (139,152)
Transferred (14,911)
Forfeited/canceled (8,087)
Nonvested shares at ending 592,280
Unrecognized stock-based compensation expense as of March 31, 2020 | $ $ 20,079
Weighted average remaining vesting period (years) as of March 31, 2020 4 years 18 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 20,384
Vested (30,954)
Transferred 14,911
Forfeited/canceled (223)
Nonvested shares at ending 261,598
Unrecognized stock-based compensation expense as of March 31, 2020 | $ $ 8,132
Weighted average remaining vesting period (years) as of March 31, 2020 3 years 3 months 18 days