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Derivative Instruments - Summary of Non-Designated Foreign Exchange Forwards (Details) - Not Designated as Hedging Instrument [Member] - Foreign Currency Contract [Member] | Jun. 30, 2017 GBP (£) contract | Dec. 31, 2016 GBP (£) contract
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Derivative [Line Items] |  |
Number of Contracts | contract | 9 | 11
Aggregate Notional Amount | £ | £ 156,458 | £ 148,310

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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 The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Details
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- Details
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