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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 Currency swaps maturing in 2013 [Member] USD ($) | Dec. 31, 2012 Currency swaps maturing in 2013 [Member] NOK | Dec. 31, 2012 Derivative Instrument Maturity Date December 2015 [Member] USD ($) | Dec. 31, 2012 Derivative Instrument Maturity Date December 2015 [Member] NOK | Dec. 31, 2012 Currency swaps maturing in 2017 [Member] USD ($) | Dec. 31, 2012 Currency swaps maturing in 2017 [Member] NOK | Dec. 31, 2012 Currency swaps maturing in 2017 [Member] USD ($) | Dec. 31, 2012 Currency swaps maturing in 2017 [Member] NOK | Dec. 31, 2012 Floating Rate Receivable [Member] | Dec. 31, 2012 Floating Rate Receivable [Member] Currency swaps maturing in 2013 [Member] | Dec. 31, 2012 Floating Rate Receivable [Member] Derivative Instrument Maturity Date December 2015 [Member] | Dec. 31, 2012 Floating Rate Receivable [Member] Currency swaps maturing in 2017 [Member] | Dec. 31, 2012 Floating Rate Receivable [Member] Currency swaps maturing in 2017 [Member] | Dec. 31, 2012 Floating Rate Payable [Member] USD ($) | Dec. 31, 2012 Floating Rate Payable [Member] Currency swaps maturing in 2013 [Member] | Dec. 31, 2012 Fixed Rate Payable [Member] Derivative Instrument Maturity Date December 2015 [Member] | Dec. 31, 2012 Fixed Rate Payable [Member] Currency swaps maturing in 2017 [Member] | Dec. 31, 2012 Fixed Rate Payable [Member] Currency swaps maturing in 2017 [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  | 2013 | 2013 | 2015 | 2015 | 2017 | 2017 | 2017 | 2017 |  |  |  |  |  |  |  |  |  |
Notional Amount |  | $ 98,500,000 | 600,000,000 | $ 122,800,000 | 700,000,000 | $ 101,400,000 | 600,000,000 | $ 125,000,000 | 700,000,000 |  |  |  |  |  | $ 200,000,000 |  |  |  |
Floating Rate Receivable and Payable Reference Rate |  |  |  |  |  |  |  |  |  |  | NIBOR | NIBOR | NIBOR | NIBOR |  | LIBOR |  |  |
Floating Rate Receivable and Payable Margin |  |  |  |  |  |  |  |  |  |  | 4.75% | 4.75% | 5.75% | 5.25% |  | 5.04% |  |  |
Fixed Rate Payable |  |  |  |  |  |  |  |  |  | 1.12% |  |  |  |  | 2.14% |  | 5.52% | 7.49% | 6.88%
Fair Value/ Carrying Amount of Asset/ Liability | $ 13,886,000 | $ 9,890,000 |  | $ 3,075,000 |  | $ 3,545,000 |  | $ (2,624,000) |  |  |  |  |  |  |  |  |  |  |

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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 Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: 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 Reference 2: 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=7491637&loc=d3e13433-108611 Reference 3: 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 4: 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=7491637&loc=d3e13495-108611 + 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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