Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested shares 258,123 213,458  
Tax benefit from stock-based award activity included in additional paid-in capital $ 2,711 $ 6,173 $ 4,310
Deferred stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred stock units, number of shares settled 435,026    
Aggregate fair value of shares vested $ 10,400 18,600  
Fully vested deferred stock units remaining outstanding 930,419    
Restricted Stock Units and Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate fair value of shares vested $ 7,000 $ 7,500  
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 226,009    
Number of shares not yet delivered 5,158    
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 Units and Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested shares 258,123    
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 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
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