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Indebtedness - Senior Note Exchange and Cash Tender Offer - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 16, 2016
Sep. 30, 2016
Sep. 30, 2013
5.875% Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate on notes   5.875%  
5.875% Senior Notes Due 2022 | Senior Note Cash Tender Offer      
Debt Instrument [Line Items]      
Early cash tender premium paid $ 3.3    
5.875% Senior Notes Due 2022 | Senior Note Cash Tender Offer | Memorial      
Debt Instrument [Line Items]      
Percentage of outstanding notes purchased 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 | Memorial      
Debt Instrument [Line Items]      
Percentage of outstanding notes exchanged 54.90%    
Unsecured Debt | 5.875% Senior Notes Due 2022 | Senior Note Exchange Offer      
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