Annual report pursuant to Section 13 and 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 ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested shares 333,724 295,597  
Tax benefit from stock-based award activity included in provision for income taxes $ 1,900 $ 2,900  
Tax benefit from stock-based award activity included in additional paid-in capital     $ 2,711
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] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
2013 Omnibus Equity Incentive Plan [Member] | Restricted Stock Awards [Member] | Maximum [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    
Vested shares 317,236    
Number of common stock shares withheld to pay employee statutory withholding taxes 55,666    
Shares of common stock delivered 317,236    
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]      
Number of common stock shares withheld to pay employee statutory withholding taxes 92,022    
Issuance of common stock for settlement of deferred stock units 237,052    
Fair value of vested, during period $ 8,300 $ 10,200 $ 10,400
Fully vested deferred stock units remaining outstanding 341,566 578,618 930,419
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]      
Fair value of vested, during period $ 11,100 $ 7,800 $ 7,000