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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Norwegian Kroner $ in Thousands | Dec. 31, 2017 USD ($) kr / $ | Dec. 31, 2017 NOK (kr) kr / $
--- | --- | ---
Derivative [Line Items] |  |
Average Forward Rate | kr / $ | 8.23 | 8.23
Fair Value / Carrying Amount of Asset (Liability) | $ 81 |
Expected Maturity | $ 12,153 |
Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Contract Amount in Foreign Currency | kr |  | kr 100,000,000

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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 Expected maturity amount of foreign currency derivatives in next fiscal year. + References No definition available. + 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 + Details
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