Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) NOK in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)	Jun. 30, 2015 NOK
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (15,349)
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	(264,244)
Cross Currency Interest Rate Contract [Member] \| Maturing In October 2015 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	(34,288)
Notional Amount	$ 122,800	NOK 700,000
Receivable Margin	4.75%	4.75%
Fixed Rate Payable	5.52%	5.52%
Remaining Term (years)	3 months 18 days
Cross Currency Interest Rate Contract [Member] \| Maturing In January 2016 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (26,776)
Notional Amount	$ 89,710	NOK 500,000
Receivable Margin	4.00%	4.00%
Fixed Rate Payable	4.94%	4.94%
Remaining Term (years)	7 months 6 days
Cross Currency Interest Rate Contract [Member] \| Maturing In January 2017 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (28,252)
Notional Amount	$ 101,351	NOK 600,000
Receivable Margin	5.75%	5.75%
Fixed Rate Payable	7.49%	7.49%
Remaining Term (years)	1 year 7 months 6 days
Cross Currency Interest Rate Contract [Member] \| Maturing In May 2017 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (39,938)
Notional Amount	$ 125,000	NOK 700,000
Receivable Margin	5.25%	5.25%
Fixed Rate Payable	6.88%	6.88%
Remaining Term (years)	1 year 9 months 18 days
Cross Currency Interest Rate Contract [Member] \| Maturing In 2018 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (44,925)
Notional Amount	$ 143,536	NOK 800,000
Receivable Margin	4.75%	4.75%
Fixed Rate Payable	6.07%	6.07%
Remaining Term (years)	2 years 7 months 6 days
Cross Currency Interest Rate Contract [Member] \| Maturing In September 2018 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (40,398)
Notional Amount	$ 150,000	NOK 900,000
Receivable Margin	4.35%	4.35%
Fixed Rate Payable	6.43%	6.43%
Remaining Term (years)	3 years 2 months 12 days
Cross Currency Interest Rate Contract [Member] \| Maturing In January 2019 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (40,604)
Notional Amount	$ 162,200	NOK 1,000,000
Receivable Margin	4.25%	4.25%
Fixed Rate Payable	6.42%	6.42%
Remaining Term (years)	3 years 7 months 6 days
Cross Currency Interest Rate Contract [Member] \| Maturing in May 2020 [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (9,063)
Notional Amount	$ 134,000	NOK 1,000,000
Receivable Margin	3.70%	3.70%
Fixed Rate Payable	5.92%	5.92%
Remaining Term (years)	4 years 10 months 24 days

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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- 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.

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- Definition

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

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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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