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Components of Debt Obligations (Parenthetical) (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
6 3/4 % Senior Notes Due 2020
   
Debt Instrument [Line Items]    
Interest percentage 6.75% 6.75%
Debt maturity period 2020 2020
6.0% Senior Notes Due 2022
   
Debt Instrument [Line Items]    
Interest percentage 6.00% 6.00%
Debt maturity period 2022 2022