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Derivatives, Net - Summary of Non-Designated Foreign Exchange Forwards (Details) - Not Designated as Hedging Instrument [Member] - Forward Currency Contract [Member]	Sep. 30, 2018 GBP (£) contract	Dec. 31, 2017 GBP (£) contract
GBP
Derivative [Line Items]
Number of Contracts | contract	35	24
Aggregate Notional Amount (in thousands) | £	£ 274,309,000	£ 177,077
EUR
Derivative [Line Items]
Number of Contracts | contract	1
Aggregate Notional Amount (in thousands) | £	£ 42,247,000

X

- 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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X

- 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.

+ Details

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X

- 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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- Details

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- Details

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- Details

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