Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail)

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Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested shares 211,356  
Windfall tax benefits net from stock-based award activity included in additional paid-in capital $ 167,000 $ 6,200,000
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 39,423  
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  
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 211,356  
2013 Omnibus Equity Incentive Plan [Member] | Deferred stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fully vested deferred stock units remaining outstanding 1,365,445