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

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Financial instrument at fair value.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fixed interest rate related to the interest rate derivative.

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Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

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Contractual rate at which a foreign currency can be purchased or sold.

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Description of the type of derivative instrument, such as a swap, forward, and option. Excludes the underlying risk of the instrument.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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Carrying amount as of the balance sheet date of the liability arising from a financial instrument or a contract used to mitigate a specified risk (hedge), and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Fair value of liability arising from a financial instrument or contract used to mitigate a specified risk (hedge), expected to be settled after one year or beyond the normal operating cycle, if longer.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Financial Instruments - Additional Information (Detail) € in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) NOK / € NOK / $ CAD / $ € / $	Sep. 30, 2016 EUR (€) NOK / € NOK / $ CAD / $ € / $	Dec. 31, 2015 USD ($)
Financial Instrument At Fair Value [Line Items]
Pretax loss amount recognized in other comprehensive income (loss) related to interest rate swap contract	$ 4,600,000
Reclassified from accumulated other comprehensive loss in to earnings (interest expense)	(2,700,000)
Pre-tax amount of accumulated other comprehensive loss expected to be reclassified to interest expense during next twelve months	(3,500,000)
Fair value of interest rate swap contract	8,100,000
Term Loan
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	1,000
Debt instrument estimated market price per $1000 principal amount	970
Accounts and Other Receivables
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts recognized as part of accounts and other receivables	700,000
Accounts Payables and Accrued Liabilities
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts recognized as part of accounts payable and accrued liabilities	200,000
Currency Forward Contracts
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts, net asset	500,000
Currency transaction gain, net	1,100,000
Interest Rate Swap
Financial Instrument At Fair Value [Line Items]
Gain loss recognized in earnings on hedge ineffectiveness	0
Interest Rate Swap \| London Interbank Offered Rate (LIBOR)
Financial Instrument At Fair Value [Line Items]
Derivative instrument, notional amount	$ 341,300,000		$ 344,750,000
Derivative, type of instrument	pay-fixed/receive-variable interest rate swap
Interest rate swap, type of interest rate	fixed
Interest rate swap, fixed rate	2.016%	2.016%
Interest rate swap, floor rate	1.00%	1.00%
Interest rate swap, effective date	Sep. 30, 2015
Interest rate swap, notional amount decline each quarter	$ 875,000
Interest rate swap, notional amount decline commencing date	Dec. 31, 2015
Interest rate swap, final maturity date	Feb. 29, 2020
Interest Rate Swap \| Accounts Payables and Accrued Liabilities
Financial Instrument At Fair Value [Line Items]
Fair value of interest rate swap contract, current	$ 3,300,000
Interest Rate Swap \| Other Noncurrent Liabilities
Financial Instrument At Fair Value [Line Items]
Fair value of interest rate swap contract, noncurrent	4,800,000
DnB Nor Bank ASA and Deutsche Bank \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Derivative instrument, notional amount \| €		€ 8.8
Foreign currency contracts maturing value \| €		€ 2.9
DnB Nor Bank ASA \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Derivative instrument, notional amount	6,500,000
Foreign currency contracts maturing value	2,200,000
Wells Fargo Bank, N.A. \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Derivative instrument, notional amount	7,400,000
Foreign currency contracts maturing value	2,500,000
Deutsche Bank \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Derivative instrument, notional amount	3,800,000
Foreign currency contracts maturing value	$ 1,300,000
Euros \| DnB Nor Bank ASA and Deutsche Bank \| October 2016 through December 2016 \| Minimum
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| NOK / €	9.44	9.44
Euros \| DnB Nor Bank ASA and Deutsche Bank \| October 2016 through December 2016 \| Maximum
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| NOK / €	9.47	9.47
US Dollar \| DnB Nor Bank ASA \| October 2016 through December 2016 \| Minimum
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| NOK / $	8.31	8.31
US Dollar \| DnB Nor Bank ASA \| October 2016 through December 2016 \| Maximum
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| NOK / $	8.32	8.32
US Dollar \| Wells Fargo Bank, N.A. \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| CAD / $	1.29	1.29
US Dollar \| Deutsche Bank \| October 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Forward currency contracts, exchange rate \| € / $	1.14	1.14