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Long-Term Debt - Additional Information - Senior Unsecured Notes (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 27, 2010 | Nov. 30, 2015 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Repayments of senior debt |  |  |  | $ 84.1 |
Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |
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 | $ 450.0 | $ 200.0 |  |  |
Percentage over par at which notes sold | 99.20% | 99.01% |  |  |
Effective interest rate |  |  |  | 8.67% |
Repayments of senior debt |  |  |  | $ 84.1 | $ 57.3
Capitalized cost included in long term debt |  |  |  | 13.3 |
Unamortized balance of the capitalized issuance cost |  |  |  | $ 1.6 |
Debt instrument, redemption price as percentage of principal amount |  |  |  | 100.00% |
Discount rate for redemption feature |  |  |  | 0.50% |
Subsequent Events | Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed interest rate on the portion of U. S. Dollar-denominated term loans outstanding |  |  | 8.50% |  |
Repayments of senior debt |  |  | $ 10.9 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 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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- 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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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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