Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail)

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Stock-Based Compensation Plans - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested shares 213,458 10,002
Tax benefits from stock-based award activity included in cash flows from financing activities $ 10,483  
Tax benefit from stock-based award activity included in additional paid-in capital $ 6,173 $ 4,310
2013 Omnibus Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of common stock shares withheld to pay employee statutory withholding taxes 22,628  
2013 Omnibus Equity Incentive Plan [Member] | Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under compensation plan 0  
Number of shares outstanding under compensation plan 0  
2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Vested shares 17,628  
2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Vested shares 195,830  
2013 Omnibus Equity Incentive Plan [Member] | SARs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under compensation plan 0  
Number of shares outstanding under compensation plan 0  
2013 Omnibus Equity Incentive Plan [Member] | Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under compensation plan 0  
Number of shares outstanding under compensation plan 0  
2013 Omnibus Equity Incentive Plan [Member] | Performance Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued under compensation plan 0  
Number of shares outstanding under compensation plan 0  
2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Deferred stock units, number of shares settled 455,151  
Fully vested deferred stock units remaining outstanding 1,365,445