Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Vested and Nonvested RSU and RSA Activity Under 2013 Plan (Detail)

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Stock-Based Compensation - Summary of Vested and Nonvested RSU and RSA Activity Under 2013 Plan (Detail) (USD $)
 0 Months Ended 6 Months Ended
May 31, 2014
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock outstanding, beginning balance, Shares   913,915
Granted   109,277
Forfeited/canceled   (36,526)
Stock outstanding, ending balance, Shares   986,666
Unrecognized stock-based compensation expense as of June 30, 2014   $ 18,168,000
Weighted average remaining vesting period as of June 30, 2014   4 years 5 months 5 days
Nonvested weighted average grant date fair value per share, beginning balance   $ 14.46
Weighted average grant date fair value per share, Granted   $ 15.74
Weighted average grant date fair value, transferred   $ 14.54
Weighted average grant date fair value, Forfeited/canceled   $ 14.65
Nonvested weighted average grant date fair value per share, ending balance   $ 14.59
Restricted Stock [Member] | Non-employee directors [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock outstanding, beginning balance, Shares   30,000
Granted 22,884 22,884
Stock outstanding, ending balance, Shares   52,884
Unrecognized stock-based compensation expense as of June 30, 2014   624,000
Weighted average remaining vesting period as of June 30, 2014   2 years 6 months 26 days
Restricted Stock Units (RSUs) [Member] | Employees [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock outstanding, beginning balance, Shares   313,155
Granted   6,991
Transferred   (5,158)
Forfeited/canceled   (24,756)
Stock outstanding, ending balance, Shares   290,232
Unrecognized stock-based compensation expense as of June 30, 2014   3,471,000
Weighted average remaining vesting period as of June 30, 2014   4 years 6 months 7 days
Restricted Stock Units (RSUs) [Member] | Independent Contractors [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock outstanding, beginning balance, Shares   570,760
Granted   79,402
Transferred   5,158
Forfeited/canceled   (11,770)
Stock outstanding, ending balance, Shares   643,550
Unrecognized stock-based compensation expense as of June 30, 2014   $ 14,073,000
Weighted average remaining vesting period as of June 30, 2014   4 years 6 months 15 days