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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) In Thousands, unless otherwise specified |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 USD ($) | Jun. 30, 2013 Cross Currency Swap One [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap One [Member] NOK | Jun. 30, 2013 Cross Currency Swap Two [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap Two [Member] NOK | Jun. 30, 2013 Cross Currency Swap Three [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap Three [Member] NOK | Jun. 30, 2013 Cross Currency Swap Four [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap Four [Member] NOK | Jun. 30, 2013 Cross Currency Swap Five [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap Five [Member] NOK | Jun. 30, 2013 Cross Currency Swap Six [Member] USD ($) | Jun. 30, 2013 Cross Currency Swap Six [Member] NOK | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap One [Member] | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap Two [Member] | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap Three [Member] | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap Four [Member] | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap Five [Member] | Jun. 30, 2013 Fixed Rate Payable [Member] Cross Currency Swap Six [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap One [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap Two [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap Three [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap Four [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap Five [Member] | Jun. 30, 2013 Floating Rate Receivable [Member] Cross Currency Swap Six [Member] | Jun. 30, 2013 Floating Rate Payable [Member] USD ($) | Jun. 30, 2013 Floating Rate Payable [Member] Cross Currency Swap One [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 34,721 | 211,500 | $ 122,800 | 700,000 | $ 89,710 | 500,000 | $ 101,351 | 600,000 | $ 125,000 | 700,000 | $ 143,536 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |
Floating Rate Receivable and Payable Reference Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | NIBOR | NIBOR | NIBOR | NIBOR | NIBOR | NIBOR |  | LIBOR
Floating Rate Receivable and Payable Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.75% | 4.75% | 4.00% | 5.75% | 5.25% | 4.75% |  | 5.04%
Fixed Rate Payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.10% | 5.52% | 4.80% | 7.49% | 6.88% | 5.93% | 1.12% |  |  |  |  |  |  | 2.14% |
Fair Value/ Carrying Amount of Asset/ Liability | $ (40,963) | $ 120 |  | $ (7,734) |  | $ (7,328) |  | $ (4,716) |  | $ (11,677) |  | $ (9,628) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Term (years) |  | 4 months 24 days | 4 months 24 days | 2 years 3 months 18 days | 2 years 3 months 18 days | 2 years 7 months 6 days | 2 years 7 months 6 days | 3 years 7 months 6 days | 3 years 7 months 6 days | 3 years 9 months 18 days | 3 years 9 months 18 days | 4 years 7 months 6 days | 4 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Variable interest rate in effect as of the balance sheet date related to the interest rate derivative. + References No definition available. + Details
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