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Indebtedness - Senior Subordinated Note Exchange- Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 16, 2016
5.00% Senior Notes Due 2023      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00% 5.00%
Maturity date of loan   Mar. 15, 2023  
5.00% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes 5.00% 5.00% 5.00%
Maturity date of loan   Aug. 15, 2022  
5.75% Senior Notes Due 2021      
Debt Instrument [Line Items]      
Interest rate on notes 5.75% 5.75% 5.75%
Maturity date of loan   Jun. 01, 2021  
Senior Notes      
Debt Instrument [Line Items]      
Interest expense on debt $ 6.6    
Premium recorded in connection with debt exchange   $ 3.5  
Percentage of premium received on face amount tendered in exchange of debt   95.00%  
Maximum redemption price of notes as percentage of principal amount   101.00%