Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-Based Compensation Plans - Summary of Vested and Nonvested RSU and RSA Activity Under 2013 Plan (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock outstanding, beginning balance, Shares 913,915
Granted 38,088
Forfeited/canceled (8,939)
Stock outstanding, ending balance, Shares 943,064
Unrecognized stock-based compensation expense as of March 31, 2014 $ 14,325
Nonvested weighted average grant date fair value per share, beginning balance $ 14.46
Weighted average grant date fair value per share, Granted $ 15.75
Weighted average grant date fair value, Forfeited/canceled $ 14.54
Nonvested weighted average grant date fair value per share, ending balance $ 14.51
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   
Forfeited/canceled   
Stock outstanding, ending balance, Shares 30,000
Unrecognized stock-based compensation expense as of March 31, 2014 312
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   
Forfeited/canceled (5,501)
Stock outstanding, ending balance, Shares 307,654
Unrecognized stock-based compensation expense as of March 31, 2014 3,888
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 38,088
Forfeited/canceled (3,438)
Stock outstanding, ending balance, Shares 605,410
Unrecognized stock-based compensation expense as of March 31, 2014 $ 10,125