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Debt - Summary of Debt and Capital Lease Obligations (Parenthetical) (Detail) - USD ($)
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
$400 Million Term Loan B [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs $ 5,865,000 $ 6,457,000
Total credit facility $ 400,000,000  
Maturity date for credit facility Jan. 15, 2021  
Spread rate added to LIBOR 2.75%  
$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 $ 4,676,000 5,107,000
Maturity date for Senior Notes Apr. 15, 2021  
$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 $ 6,094,000 6,469,000
Maturity date for Senior Notes Apr. 15, 2023  
$700 Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Unamortized deferred financing costs $ 6,301,000 $ 7,335,000
Total credit facility $ 700,000,000  
Maturity date for credit facility Jun. 05, 2019  
Spread rate added to LIBOR 1.65%