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Long-Term Debt - Summary of Long-Term Debt (Detail) In Thousands, unless otherwise specified | Jun. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2013 Revolving Credit Facilities [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facilities [Member] USD ($) | Jun. 30, 2013 Senior Notes (8.5%) due January 15, 2020 [Member] USD ($) | Dec. 31, 2012 Senior Notes (8.5%) due January 15, 2020 [Member] USD ($) | Jun. 30, 2013 Norwegian Kroner-denominated Bonds due through January 2018 [Member] USD ($) | Dec. 31, 2012 Norwegian Kroner-denominated Bonds due through January 2018 [Member] USD ($) | Jun. 30, 2013 U.S. Dollar-denominated Term Loans due through 2021 [Member] USD ($) | Dec. 31, 2012 U.S. Dollar-denominated Term Loans due through 2021 [Member] USD ($) | Dec. 31, 2012 U.S. Dollar-denominated Term Loan of Variable Interest Entity due October 2016 [Member] USD ($) | Jun. 30, 2013 Euro-denominated Term Loans due through 2023 [Member] USD ($) | Jun. 30, 2013 Euro-denominated Term Loans due through 2023 [Member] EUR (€) | Dec. 31, 2012 Euro-denominated Term Loans due through 2023 [Member] USD ($) | Dec. 31, 2012 Euro-denominated Term Loans due through 2023 [Member] EUR (€) | Jun. 30, 2013 U.S. Dollar-denominated Unsecured Demand Loans due to Joint Venture Partners [Member] USD ($) | Dec. 31, 2012 U.S. Dollar-denominated Unsecured Demand Loans due to Joint Venture Partners [Member] USD ($) | Jun. 30, 2013 Co-venturer [Member] U.S. Dollar-denominated Unsecured Demand Loans due to Joint Venture Partners [Member] USD ($) | Dec. 31, 2012 Co-venturer [Member] U.S. Dollar-denominated Unsecured Demand Loans due to Joint Venture Partners [Member] USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 5,743,109 | $ 5,559,714 | $ 1,705,306 | $ 1,627,979 | $ 447,269 | $ 447,115 | $ 578,509 | $ 467,223 | $ 2,669,263 | $ 2,432,374 | $ 230,359 | $ 329,480 | € 253,300 | $ 341,382 | € 258,800 | $ 13,300 | $ 13,300 | $ 13,282 | $ 13,282
Less current portion | 942,964 | 797,411 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion | $ 4,800,145 | $ 4,762,303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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