Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2017
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested shares, beginning balance   1,050,430
Granted 146,285 146,285
Vested   (239,368)
Transferred   0
Forfeited/canceled   (2,713)
Nonvested shares, ending balance   954,634
Unrecognized stock-based compensation expense as of March 31, 2017   $ 21,730
Weighted average remaining vesting period (years) as of March 31, 2017   3 years 2 months 27 days
Nonvested weighted average grant date fair value per share, beginning balance   $ 22.38
Weighted average grant date fair value per share, Granted   27.50
Weighted average grant date fair value, Vested   19.70
Weighted average grant date fair value, Transferred   26.63
Weighted average grant date fair value, Forfeited/canceled   20.62
Nonvested weighted average grant date fair value per share, ending balance   $ 23.84
Restricted Stock Awards [Member] | Non-Employee Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested shares, beginning balance   29,112
Granted 0 0
Vested   0
Transferred   0
Forfeited/canceled   0
Nonvested shares, ending balance   29,112
Unrecognized stock-based compensation expense as of March 31, 2017   $ 393
Weighted average remaining vesting period (years) as of March 31, 2017   1 year 8 months 12 days
Restricted Stock Units [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested shares, beginning balance   566,480
Granted 139,013 139,013
Vested   (129,594)
Transferred   (24,302)
Forfeited/canceled   (2,713)
Nonvested shares, ending balance   548,884
Unrecognized stock-based compensation expense as of March 31, 2017   $ 13,331
Weighted average remaining vesting period (years) as of March 31, 2017   3 years 7 months 28 days
Restricted Stock Units [Member] | Independent Contractors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested shares, beginning balance   454,838
Granted 7,272 7,272
Vested   (109,774)
Transferred   24,302
Forfeited/canceled   0
Nonvested shares, ending balance   376,638
Unrecognized stock-based compensation expense as of March 31, 2017   $ 8,006
Weighted average remaining vesting period (years) as of March 31, 2017   2 years 7 months 10 days