Annual report pursuant to Section 13 and 15(d)

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

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Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares at beginning 918,379 800,075 891,575
Granted 381,215 434,705 355,130
Vested (277,253) (284,503) (400,616)
Transferred 0 0 0
Forfeited/canceled (41,405) (31,898) (46,014)
Nonvested shares at ending 980,936 918,379 800,075
Unrecognized stock-based compensation expense as of December 31, 2021 $ 28,645    
Weighted average remaining vesting period (years) as of December 31, 2021 3 years 4 months 17 days    
Nonvested weighted average grant date fair value per share, beginning balance $ 33.73 $ 33.91 $ 27.59
Weighted average grant date fair value per share, Granted 39.03 32.80 38.51
Weighted average grant date fair value per share, Vested 31.89 32.74 24.29
Weighted average grant date fair value per share, Transferred 34.98 33.67 29.68
Weighted average grant date fair value per share, Forfeited/canceled 33.47 34.49 30.65
Nonvested weighted average grant date fair value per share, ending balance $ 36.32 $ 33.73 $ 33.91
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 17,480 27,096
Granted 13,323 19,516 12,806
Vested (16,728) (20,268) (22,422)
Transferred 0 0 0
Forfeited/canceled 0 0 0
Nonvested shares at ending 13,323 16,728 17,480
Unrecognized stock-based compensation expense as of December 31, 2021 $ 177    
Weighted average remaining vesting period (years) as of December 31, 2021 4 months 2 days    
Restricted Stock Units [Member] | Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares at beginning 637,650 525,115 471,782
Granted 277,462 322,910 260,274
Vested (172,327) (170,291) (186,311)
Transferred (10,649) (18,294) (8,136)
Forfeited/canceled (34,357) (21,790) (12,494)
Nonvested shares at ending 697,779 637,650 525,115
Unrecognized stock-based compensation expense as of December 31, 2021 $ 20,389    
Weighted average remaining vesting period (years) as of December 31, 2021 3 years 5 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 264,001 257,480 392,697
Granted 90,430 92,279 82,050
Vested (88,198) (93,944) (191,883)
Transferred 10,649 18,294 8,136
Forfeited/canceled (7,048) (10,108) (33,520)
Nonvested shares at ending 269,834 264,001 257,480
Unrecognized stock-based compensation expense as of December 31, 2021 $ 8,079    
Weighted average remaining vesting period (years) as of December 31, 2021 3 years 4 months 9 days