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Indebtedness - Senior Note Exchange and Cash Tender Offer - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 16, 2016
Sep. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
5.875% Senior Notes Due 2022        
Debt Instrument [Line Items]        
Interest rate on notes     5.875% 5.875%
Senior Note Cash Tender Offer | 5.875% Senior Notes Due 2022        
Debt Instrument [Line Items]        
Early cash tender premium paid $ 3.3      
Senior Note Cash Tender Offer | 5.875% Senior Notes Due 2022 | MRD        
Debt Instrument [Line Items]        
Percentage of outstanding notes acquired 44.90%      
Principal amount purchased $ 269.7      
Senior Notes        
Debt Instrument [Line Items]        
Maximum redemption price of notes as percentage of principal amount     101.00%  
Senior Notes | Senior Note Exchange Offer | MRD        
Debt Instrument [Line Items]        
Percentage of outstanding notes exchanged 54.90%      
Unsecured Debt | Senior Note Exchange Offer | 5.875% Senior Notes Due 2022        
Debt Instrument [Line Items]        
Senior notes exchange amount $ 329.2      
Interest rate on notes 5.875%      
Maturity date of loan   Jul. 01, 2022    
Maximum redemption price of notes as percentage of principal amount     100.00%  
Deferred financing costs $ 6.3      
Early cash tender premium paid $ 4.1