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Debt - Summary of Debt and Capital Lease Obligations (Parenthetical) (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
$200 Million Term Loan A [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs $ 1,557,000 $ 0
Total credit facility 200,000,000  
$500 Million Term Loan B [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs 7,595,000  
Total credit facility 500,000,000  
$400 Million Term Loan B [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs 0 5,273,000
Total credit facility 400,000,000  
$350 Million 5% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total Senior Notes $ 350,000,000  
Interest rate of Senior Notes 5.00%  
Unamortized deferred financing costs $ 3,340,000 4,246,000
$400 Million 5% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total Senior Notes $ 400,000,000  
Interest rate of Senior Notes 5.00%  
Unamortized deferred financing costs $ 4,929,000 5,719,000
$700 Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs 9,076,000 $ 5,267,000
Total credit facility $ 700,000,000