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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In October 2015 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In October 2015 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2016 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2016 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2017 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2017 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In May 2017 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In May 2017 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In 2018 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In 2018 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In September 2018 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In September 2018 [Member] NIBOR [Member] NOK	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2019 [Member] NIBOR [Member] USD ($)	Jun. 30, 2014 Cross Currency Interest Rate Contract [Member] Maturing In January 2019 [Member] NIBOR [Member] NOK
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (354)	$ (63,741)	$ (9,537)		$ (8,943)		$ (6,337)		$ (14,513)		$ (14,285)		$ (7,505)		$ (2,621)
Notional Amount NOK			$ 122,800	700,000	$ 89,700	500,000	$ 101,400	600,000	$ 125,000	700,000	$ 143,500	800,000	$ 150,000	900,000	$ 162,200	1,000,000
Receivable Margin			4.75%	4.75%	4.00%	4.00%	5.75%	5.75%	5.25%	5.25%	4.75%	4.75%	4.35%	4.35%	4.25%	4.25%
Fixed Rate Payable			5.52%	5.52%	4.80%	4.80%	7.49%	7.49%	6.88%	6.88%	5.93%	5.93%	6.43%	6.43%	6.28%	6.28%
Remaining Term (years)			1 year 3 months 18 days	1 year 3 months 18 days	1 year 7 months 6 days	1 year 7 months 6 days	2 years 7 months 6 days	2 years 7 months 6 days	2 years 9 months 18 days	2 years 9 months 18 days	3 years 7 months 6 days	3 years 7 months 6 days	4 years 2 months 12 days	4 years 2 months 12 days	4 years 7 months 6 days	4 years 7 months 6 days

X

- 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

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X

- Definition

Average remaining period until maturity of the derivative contract, 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

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ 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

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: 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

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