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Long-Term Debt - Additional Information - Senior unsecured notes (Detail) - Senior Notes (8.5%) due January 15, 2020 [Member] | 6 Months Ended
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Jun. 30, 2016 USD ($)
The 8.5% Notes due in January 2020 [Member] |
Debt Instrument [Line Items] |
Fixed interest rate on the portion of U. S. Dollar-denominated term loans outstanding | 8.50%
Effective interest rate | 8.67%
Capitalized cost included in other non-current asset | $ 13,300,000
Debt instrument, redemption price as percentage of principal amount | 100.00%
Discount rate for redemption feature | 0.50%
Repurchased principal amount | $ 57,300,000
Premium on bond repurchases | 7,700,000
The 8.5% Notes due in January 2020 [Member] | Long-term Debt [Member] |
Debt Instrument [Line Items] |
Unamortized debt issuance expense | 6,600,000
The Original Notes [Member] |
Debt Instrument [Line Items] |
Senior unsecured bonds issued | $ 450,000,000
Percentage over par at which notes sold | 99.181%
The Notes [Member] |
Debt Instrument [Line Items] |
Senior unsecured bonds issued | $ 200,000,000
Percentage over par at which notes sold | 99.01%

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