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Long-Term Debt - Additional Information - Senior Unsecured Notes (Detail) - Senior Notes (8.5%) due January 15, 2020 - USD ($) |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 27, 2010 | Nov. 30, 2015 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |
Fixed interest rate on the portion of U. S. Dollar-denominated term loans outstanding | 8.50% | 8.50% | 8.50%
Debt instrument, principal amount | $ 450,000,000 | $ 200,000,000 |
Percentage over par at which notes sold | 99.181% | 99.01% |
Effective interest rate |  |  | 8.67%
Capitalized cost included in other non-current asset |  |  | $ 13,300,000
Unamortized debt issuance expense |  |  | $ 4,700,000
Debt instrument, redemption price as percentage of principal amount |  |  | 100.00%
Discount rate for redemption feature |  |  | 0.50%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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