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Debt - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jan. 12, 2016
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Company indebtedness   $ 0 $ 0  
Remaining available borrowing capacity   200,000,000 $ 200,000,000  
Third Amended and Restated Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Termination date of the Credit Agreement     Jan. 12, 2021  
Third Amended and Restated Credit Agreement [Member] | Federal Funds Rate [Member]        
Line of Credit Facility [Line Items]        
Interest rate 0.50%      
Third Amended and Restated Credit Agreement [Member] | Eurodollar Rate Loans [Member]        
Line of Credit Facility [Line Items]        
Interest rate 1.00%      
Second Amended and Restated Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Credit facility covenant terms       The material financial covenants and restrictions do not permit the Company’s fixed charge coverage ratio to be less than 1.5 to 1.0 and do not permit the Company’s consolidated debt to consolidated EBITDA ratio to exceed 3.0 to 1.0, measured as of the end of each fiscal quarter (and in the case of Consolidated EBITDA, for the four-quarter period ending on such date).
Revolver Loans Portion Effective January 1 through June 30 [Member] | Third Amended and Restated Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Revolving loans in a collective maximum principal amount   250,000,000 $ 250,000,000  
Revolver Loans Portion Effective July 1 through December 31 [Member] | Third Amended and Restated Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Revolving loans in a collective maximum principal amount   $ 200,000,000 200,000,000  
Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Minimum [Member]        
Line of Credit Facility [Line Items]        
Fixed charge coverage ratio as per credit agreement   1.5    
Revolving Credit Facility [Member] | Second Amended and Restated Credit Agreement [Member] | Maximum [Member]        
Line of Credit Facility [Line Items]        
Consolidated debt to earnings before interest taxes depreciation amortization ratio as per the credit agreement   3.0    
Revolving Credit Facility [Member] | Letter of Credit Facility Sublimit [Member]        
Line of Credit Facility [Line Items]        
Revolving loans in a collective maximum principal amount   $ 15,000,000 15,000,000  
Revolving Credit Facility [Member] | Swing Advance Loan Sublimit [Member]        
Line of Credit Facility [Line Items]        
Revolving loans in a collective maximum principal amount   $ 5,000,000 $ 5,000,000