Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Nonvested shares, beginning balance           1,026,113 1,207,009
Granted 27,912 62,389 33,981 30,000 181,352 335,634 88,708
Vested           (258,123) (213,458)
Transferred           0 0
Forfeited/canceled           (53,194) (56,146)
Nonvested shares, ending balance           1,050,430 1,026,113
Nonvested weighted average grant date fair value per share, beginning balance           $ 21.17 $ 18.23
Unrecognized stock-based compensation expense as of December 31, 2016           $ 19,340  
Weighted average grant date fair value per share, Granted           $ 23.76 42.91
Weighted average remaining vesting period (years) as of December 31, 2016           3 years 26 days  
Weighted average grant date fair value, Vested           $ 19.88 14.90
Weighted average grant date fair value, Transferred           14.54 17.81
Weighted average grant date fair value, Forfeited/canceled           20.07 16.29
Nonvested weighted average grant date fair value per share, ending balance           $ 22.38 $ 21.17
Restricted Stock Awards [Member] | Non-Employee Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Nonvested shares, beginning balance           35,364 42,882
Granted 0 0 14,742 0 0 14,742 10,110
Vested           (20,994) (17,628)
Transferred           0 0
Forfeited/canceled           0 0
Nonvested shares, ending balance           29,112 35,364
Unrecognized stock-based compensation expense as of December 31, 2016           $ 482  
Weighted average remaining vesting period (years) as of December 31, 2016           1 year 9 months 29 days  
Restricted Stock Units [Member] | Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Nonvested shares, beginning balance           468,969 516,437
Granted 12,684 12,781 11,051 30,000 172,496 239,012 31,713
Vested           (104,820) (57,711)
Transferred           2,062 (8,423)
Forfeited/canceled           (38,743) (13,047)
Nonvested shares, ending balance           566,480 468,969
Unrecognized stock-based compensation expense as of December 31, 2016           $ 10,299  
Weighted average remaining vesting period (years) as of December 31, 2016           3 years 4 months 24 days  
Restricted Stock Units [Member] | Independent Contractors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Nonvested shares, beginning balance           521,780 647,690
Granted 15,228 49,608 8,188 0 8,856 81,880 46,885
Vested           (132,309) (138,119)
Transferred           (2,062) 8,423
Forfeited/canceled           (14,451) (43,099)
Nonvested shares, ending balance           454,838 521,780
Unrecognized stock-based compensation expense as of December 31, 2016           $ 8,559  
Weighted average remaining vesting period (years) as of December 31, 2016           2 years 9 months