Debt Instrument, Discount Rate

No definition available.

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- Definition

Debt Instrument, Percentage of Face Value Issued

+ References

No definition available.

+ Details

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- Definition

Redemption of Debt, Call Premium Paid

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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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.

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

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-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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Debt, Net - Cabot Senior Secured Notes - Narrative (Details) $ in Thousands	Oct. 06, 2016 USD ($)	Nov. 11, 2015 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 06, 2016 GBP (£)	Nov. 11, 2015 EUR (€)	Mar. 27, 2014 USD ($)	Mar. 27, 2014 GBP (£)	Aug. 02, 2013 USD ($)	Aug. 02, 2013 GBP (£)
Debt Instrument [Line Items]
Senior secured notes			$ 325,000	$ 326,029
Unamortized discount			27,828	32,720
Secured Debt
Debt Instrument [Line Items]
Senior secured notes			$ 1,186,200	$ 1,214,600
Cabot 2020 Notes \| Senior Notes
Debt Instrument [Line Items]
Senior secured notes									$ 151,700	£ 100,000,000
Stated interest rate (as a percent)									8.375%	8.375%
Existing Cabot 2021 Notes \| Senior Notes
Debt Instrument [Line Items]
Senior secured notes							$ 291,800	£ 175,000,000.0
Stated interest rate (as a percent)							6.50%	6.50%
Cabot 2023 Notes \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	7.50%				7.50%
Debt issued	$ 442,600				£ 350,000,000.0
Face value issued (as a percent)	100.00%
Call premium paid	$ 17,400				£ 13,700,000
Senior Secured Cabot Floating Rate Notes \| Secured Debt
Debt Instrument [Line Items]
Senior secured notes		$ 332,200				€ 310,000,000.0
Discount rate (as a percent)		1.00%
Unamortized discount		$ 3,400				€ 3,100,000
Senior Secured Cabot Floating Rate Notes \| Secured Debt \| Three-Month EURIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		5.875%