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Indebtedness - Senior Subordinated Note Exchange- Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Sep. 16, 2016
Dec. 31, 2015
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%