Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Norwegian Kroner NOK in Thousands, $ in Thousands	Sep. 30, 2017 USD ($) NOK / $	Sep. 30, 2017 NOK NOK / $
Derivative [Line Items]
Average Forward Rate \| NOK / $	8.24	8.24
Fair Value / Carrying Amount of Asset (Liability)	$ 537
Expected Maturity, 2017	3,616
Expected Maturity, 2018	$ 12,153
Contract Amount in Foreign Currency
Derivative [Line Items]
Contract Amount in Foreign Currency \| NOK		NOK 130,000

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

Expected maturity amount of foreign currency derivatives in current fiscal year.

+ References

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- Definition

Expected maturity amount of foreign currency derivatives in remainder of fiscal year.

+ References

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- Definition

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

+ 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.

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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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