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 $)
 1 Months Ended 9 Months Ended
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock outstanding, beginning balance, Shares       913,915
Granted 18,820 61,655 38,088 118,563
Forfeited/canceled       (39,224)
Stock outstanding, ending balance, Shares       993,254
Unrecognized stock-based compensation expense as of September 30, 2014       $ 19,859,000
Weighted average remaining vesting period as of September 30, 2014       4 years 2 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       $ 17.06
Weighted average grant date fair value, transferred       $ 14.54
Weighted average grant date fair value, Forfeited/canceled       $ 14.67
Nonvested weighted average grant date fair value per share, ending balance       $ 14.76
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 September 30, 2014       563,000
Weighted average remaining vesting period as of September 30, 2014       2 years 3 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 6,346 6,991   13,337
Transferred       (5,158)
Forfeited/canceled       (27,454)
Stock outstanding, ending balance, Shares       293,880
Unrecognized stock-based compensation expense as of September 30, 2014       3,357,000
Weighted average remaining vesting period as of September 30, 2014       4 years 3 months 11 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 12,474 31,780 38,088 82,342
Transferred       5,158
Forfeited/canceled       (11,770)
Stock outstanding, ending balance, Shares       646,490
Unrecognized stock-based compensation expense as of September 30, 2014       $ 15,939,000
Weighted average remaining vesting period as of September 30, 2014       4 years 3 months 15 days