Annual report pursuant to Section 13 and 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 $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested weighted average grant date fair value beginning balance       
Granted 913,915    
Vested       
Forfeited/canceled       
Stock outstanding, ending balance, Shares 913,915    
Weighted average grant date fair value per share for shares granted during the period $ 14.46    
Vested, weighted average grant date fair value       
Forfeited/canceled, weighted average grant date fair value       
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock outstanding, beginning balance, Shares 27,999 24,499 28,447
Nonvested weighted average grant date fair value beginning balance $ 23.67 $ 23.36 $ 20.95
Granted 750 3,500 6,462
Forfeited/canceled      1,866
Stock outstanding, ending balance, Shares    27,999 24,499
Forfeited/canceled, weighted average grant date fair value     $ 23.07
Nonvested weighted average grant date fair value ending balance   $ 23.67 $ 23.36
Restricted Stock [Member] | Non-employee directors [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 30,000    
Vested       
Forfeited/canceled       
Stock outstanding, ending balance, Shares 30,000    
Weighted average grant date fair value per share for shares granted during the period $ 12.00    
Restricted Stock Units (RSUs) [Member] | Employee [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 313,155    
Vested       
Forfeited/canceled       
Stock outstanding, ending balance, Shares 313,155    
Weighted average grant date fair value per share for shares granted during the period $ 14.54    
Restricted Stock Units (RSUs) [Member] | Independent Contractors [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 570,760    
Vested       
Forfeited/canceled       
Stock outstanding, ending balance, Shares 570,760    
Weighted average grant date fair value per share for shares granted during the period $ 14.54