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

Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price.

+ 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

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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- Details

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Fair Value Measurements - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018 USD ($) Contract	Jun. 30, 2018 GBP (£) Contract	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2017 GBP (£) Contract
Forward Contract to Sell [Member]
Derivative [Line Items]
Number of forward contract outstanding	1	1	1	1
Forward contract outstanding \| £		£ 2,600,000		£ 2,500,000
Forward Contract to Purchase [Member]
Derivative [Line Items]
Number of forward contract outstanding \| Contract	1	1	1	1
Forward contract outstanding \| $	$ 3,400,000		$ 3,400,000
Forward Contracts [Member]
Derivative [Line Items]
Forward contract terms	One 30-day forward contract