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, 2015
May. 31, 2015
Feb. 28, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares, beginning balance       1,207,009
Granted 30,755 22,464 25,567 78,786
Vested       (201,224)
Forfeited/canceled       (28,951)
Nonvested shares, ending balance       1,055,620
Unrecognized stock-based compensation expense as of September 30, 2015       $ 29,514
Weighted average remaining vesting period (years) as of September 30, 2015       3 years 6 months 29 days
Nonvested weighted average grant date fair value per share, beginning balance       $ 18.23
Weighted average grant date fair value per share, Granted       42.84
Weighted average grant date fair value, Vested       14.85
Weighted average grant date fair value, Transferred       17.81
Weighted average grant date fair value, Forfeited/canceled       17.78
Nonvested weighted average grant date fair value per share, ending balance       $ 20.73
Restricted Stock [Member] | Non-employee directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares, beginning balance       42,882
Granted   10,110   10,110
Vested       (7,626)
Nonvested shares, ending balance       45,366
Unrecognized stock-based compensation expense as of September 30, 2015       $ 634
Weighted average remaining vesting period (years) as of September 30, 2015       1 year 11 months 23 days
Restricted Stock Units (RSUs) [Member] | Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares, beginning balance       516,437
Granted 5,607 8,142 15,847 29,596
Vested       (56,719)
Transferred       (8,423)
Forfeited/canceled       (13,047)
Nonvested shares, ending balance       467,844
Unrecognized stock-based compensation expense as of September 30, 2015       $ 9,185
Weighted average remaining vesting period (years) as of September 30, 2015       4 years 15 days
Restricted Stock Units (RSUs) [Member] | Independent Contractors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares, beginning balance       647,690
Granted 25,148 4,212 9,720 39,080
Vested       (136,879)
Transferred       8,423
Forfeited/canceled       (15,904)
Nonvested shares, ending balance       542,410
Unrecognized stock-based compensation expense as of September 30, 2015       $ 19,695
Weighted average remaining vesting period (years) as of September 30, 2015       3 years 4 months 28 days