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Long-Term Debt - Additional Information - Senior unsecured notes (Detail) (Senior Notes (8.5%) due January 15, 2020 [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Senior Notes (8.5%) due January 15, 2020 [Member]
 
Debt Instrument [Line Items]  
Fixed interest rate on the portion of U. S. Dollar-denominated term loans outstanding 8.50%
Debt instrument, principal amount $ 450.0
Percentage over par at which notes sold 99.181%
Effective interest rate 8.625%
Capitalized cost included in other non-current asset $ 9.4
Debt instrument, redemption price as percentage of principal amount 100.00%
Discount rate for redemption feature 0.50%