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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Jun. 30, 2017 € in Thousands, NOK in Thousands, $ in Thousands | USD ($) € / $ NOK / $ | EUR (€) € / $ NOK / $ | NOK € / $ NOK / $
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Fair Value / Carrying Amount of Asset (Liability) | $ 653 |  |
Expected Maturity, 2017 | 39,620 |  |
Expected Maturity, 2018 | $ 19,982 |  |
Euro |  |  |
Derivative [Line Items] |  |  |
Average Forward Rate | € / $ | 0.92 | 0.92 | 0.92
Fair Value / Carrying Amount of Asset (Liability) | $ 449 |  |
Expected Maturity, 2017 | 8,153 |  |
Expected Maturity, 2018 | $ 0 |  |
Euro | Contract Amount in Foreign Currency |  |  |
Derivative [Line Items] |  |  |
Contract Amount in Foreign Currency | € |  | € 7,500 |
Norwegian Kroner |  |  |
Derivative [Line Items] |  |  |
Average Forward Rate | NOK / $ | 8.36 | 8.36 | 8.36
Fair Value / Carrying Amount of Asset (Liability) | $ 204 |  |
Expected Maturity, 2017 | 31,467 |  |
Expected Maturity, 2018 | $ 19,982 |  |
Norwegian Kroner | Contract Amount in Foreign Currency |  |  |
Derivative [Line Items] |  |  |
Contract Amount in Foreign Currency | NOK |  |  | NOK 430,000

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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 remainder of 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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