Quarterly report pursuant to Section 13 or 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
1 Months Ended 9 Months Ended
Aug. 31, 2016
May 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Nov. 30, 2013
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested shares, beginning balance           1,026,113
Granted 62,389 33,981 30,000 181,352   307,722
Vested           (239,396)
Forfeited/canceled           (41,434)
Nonvested shares, ending balance           1,053,005
Unrecognized stock-based compensation expense as of September 30, 2016           $ 20,603
Weighted average remaining vesting period (years) as of September 30, 2016           3 years 2 months 19 days
Nonvested weighted average grant date fair value per share, beginning balance           $ 21.17
Weighted average grant date fair value per share, Granted $ 0 $ 0 $ 0 $ 0   23.79
Weighted average grant date fair value, Vested           20.03
Weighted average grant date fair value, Forfeited/canceled           21.64
Nonvested weighted average grant date fair value per share, ending balance           $ 22.18
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
Granted 0 14,742 0 0 30,000 14,742
Vested           (10,998)
Forfeited/canceled           0
Nonvested shares, ending balance           39,108
Unrecognized stock-based compensation expense as of September 30, 2016           $ 584
Weighted average remaining vesting period (years) as of September 30, 2016           1 year 11 months 19 days
Restricted Stock Units (RSUs) [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested shares, beginning balance           468,969
Granted 12,781 11,051 30,000 172,496   226,328
Vested           (103,428)
Forfeited/canceled           (37,299)
Nonvested shares, ending balance           554,570
Unrecognized stock-based compensation expense as of September 30, 2016           $ 10,836
Weighted average remaining vesting period (years) as of September 30, 2016           3 years 7 months 6 days
Restricted Stock Units (RSUs) [Member] | Independent Contractors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Nonvested shares, beginning balance           521,780
Granted 49,608 8,188 0 8,856   66,652
Vested           (124,970)
Forfeited/canceled           (4,135)
Nonvested shares, ending balance           459,327
Unrecognized stock-based compensation expense as of September 30, 2016           $ 9,183
Weighted average remaining vesting period (years) as of September 30, 2016           2 years 10 months 10 days