Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail) NOK in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2016 NOK
Cross Currency Interest Rate Contract [Member] \| NIBOR [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (258,568)
Cross Currency Interest Rate Contract [Member] \| Maturing In May 2017 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 125,000	NOK 700,000
Receivable Margin	5.25%	5.25%
Fixed Rate Payable	6.88%	6.88%
Fair Value / Carrying Amount of Asset / (Liability)	$ (44,079)
Remaining Term (years)	9 months 18 days
Cross Currency Interest Rate Contract [Member] \| Maturing in September 2018 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 150,000	NOK 900,000
Receivable Margin	4.35%	4.35%
Fixed Rate Payable	6.43%	6.43%
Fair Value / Carrying Amount of Asset / (Liability)	$ (48,959)
Remaining Term (years)	2 years 2 months 12 days
Cross Currency Interest Rate Contract [Member] \| Maturing In May 2020 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 134,000	NOK 1,000,000
Receivable Margin	3.70%	3.70%
Fixed Rate Payable	5.92%	5.92%
Fair Value / Carrying Amount of Asset / (Liability)	$ (20,923)
Remaining Term (years)	3 years 10 months 24 days
Cross Currency Interest Rate Contract [Member] \| Maturing In November 2018 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 101,351	NOK 600,000
Receivable Margin	5.75%	5.75%
Fixed Rate Payable	8.84%	8.84%
Fair Value / Carrying Amount of Asset / (Liability)	$ (34,817)
Remaining Term (years)	2 years 4 months 26 days
Cross Currency Interest Rate Contract [Member] \| Maturing In December 2018 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 143,536	NOK 800,000
Receivable Margin	5.75%	5.75%
Fixed Rate Payable	7.58%	7.58%
Fair Value / Carrying Amount of Asset / (Liability)	$ (55,132)
Remaining Term (years)	2 years 6 months
Cross Currency Interest Rate Contract [Member] \| Maturing In January 2019 [Member] \| NIBOR [Member]
Derivative [Line Items]
Notional Amount	$ 162,200	NOK 1,000,000
Receivable Margin	4.25%	4.25%
Fixed Rate Payable	7.45%	7.45%
Fair Value / Carrying Amount of Asset / (Liability)	$ (54,658)
Remaining Term (years)	2 years 7 months 6 days
Foreign currency contracts [Member] \| Maturing In November 2018 [Member]
Derivative [Line Items]
Notional Amount	$ 1,200	NOK 7,200
Debt instrument, premium, percent	3.00%	3.00%
Foreign currency contracts [Member] \| Maturing In December 2018 [Member]
Derivative [Line Items]
Notional Amount	$ 3,400	NOK 19,200
Debt instrument, premium, percent	3.00%	3.00%

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

Debt Instrument, Premium, Percent

+ References

No definition available.

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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

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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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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