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 3 Months Ended
Mar. 31, 2016
Feb. 29, 2016
Nov. 30, 2013
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares, beginning balance       1,026,113
Granted 30,000 181,352   211,352
Vested       (211,356)
Transferred       0
Forfeited/canceled       (7,536)
Nonvested shares, ending balance 1,018,573     1,018,573
Unrecognized stock-based compensation expense as of March 31, 2016 $ 21,985     $ 21,985
Weighted average remaining vesting period (years) as of March 31, 2016       3 years 6 months 18 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   22.98
Weighted average grant date fair value, Vested       18.88
Weighted average grant date fair value, Transferred       0
Weighted average grant date fair value, Forfeited/canceled       17.91
Nonvested weighted average grant date fair value per share, ending balance $ 22.05     $ 22.05
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 0 30,000 0
Vested       0
Transferred       0
Forfeited/canceled       0
Nonvested shares, ending balance 35,364     35,364
Unrecognized stock-based compensation expense as of March 31, 2016 $ 454     $ 454
Weighted average remaining vesting period (years) as of March 31, 2016       1 year 6 months 26 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 30,000 172,496   202,496
Vested       (98,144)
Transferred       0
Forfeited/canceled       (6,300)
Nonvested shares, ending balance 567,021     567,021
Unrecognized stock-based compensation expense as of March 31, 2016 $ 12,377     $ 12,377
Weighted average remaining vesting period (years) as of March 31, 2016       4 years 11 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 0 8,856   8,856
Vested       (113,212)
Transferred       0
Forfeited/canceled       (1,236)
Nonvested shares, ending balance 416,188     416,188
Unrecognized stock-based compensation expense as of March 31, 2016 $ 9,154     $ 9,154
Weighted average remaining vesting period (years) as of March 31, 2016       3 years