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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- Definition

Redemption of Debt, Gain (Loss) on Premium Paid

+ References

No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Period Type:	duration

- 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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

+ Details

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

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph 8
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- 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://www.xbrl.org/2003/role/presentationRef
-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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Debt - Cabot Senior Debt (Details) $ in Thousands			12 Months Ended
Debt - Cabot Senior Debt (Details) $ in Thousands	Oct. 06, 2016 USD ($)	Nov. 11, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 GBP (£)	Oct. 06, 2016 GBP (£)	Nov. 11, 2015 EUR (€)	Mar. 27, 2014 USD ($)	Mar. 27, 2014 GBP (£)	Aug. 02, 2013 USD ($)	Aug. 02, 2013 GBP (£)	Jul. 25, 2013 USD ($)	Jul. 25, 2013 GBP (£)	Sep. 20, 2012 USD ($)	Sep. 20, 2012 GBP (£)
Debt Instrument [Line Items]
Senior secured notes			$ 326,029	$ 11,320
Unamortized debt discount			32,720	31,968
Cabot Senior Secured Notes
Debt Instrument [Line Items]
Interest expense—stated coupon rate			93,691	105,606
Total interest expense			91,293	97,275
Cabot 2019 Notes
Debt Instrument [Line Items]
Senior secured notes														$ 438,400	£ 265,000,000
Debt instrument, interest rate														10.375%	10.375%
Redemption of notes, call premium paid	$ 17,400					£ 13,700,000
Add: debt premium	19,200					15,200,000
Gain recognized on redemption of notes from premium paid	1,800					1,400,000
Cabot 2020 Notes
Debt Instrument [Line Items]
Senior secured notes										$ 151,700	£ 100,000,000
Debt instrument, interest rate										8.375%	8.375%
Cabot 2021 Notes
Debt Instrument [Line Items]
Senior secured notes								$ 291,800	£ 175,000,000.0
Debt instrument, interest rate								6.50%	6.50%
Cabot 2023 Notes
Debt Instrument [Line Items]
Senior secured notes	$ 442,600					£ 350,000,000.0
Debt instrument, interest rate	7.50%					7.50%
Percentage of face value issued	100.00%
Secured Debt \| Senior Secured Cabot Floating Rate Notes
Debt Instrument [Line Items]
Senior secured notes		$ 332,200					€ 310,000,000.0
Debt instrument, discount rate		1.00%
Unamortized debt discount		$ 3,400					€ 3,100,000
Secured Debt \| Cabot Senior Secured Notes
Debt Instrument [Line Items]
Senior secured notes			1,214,600	1,295,700
10.5% Senior Secured Notes Due 2020 \| Marlin
Debt Instrument [Line Items]
Senior secured notes												$ 246,500	£ 150,000,000.0
Debt instrument, interest rate												10.50%	10.50%
Redemption of notes, call premium paid			10,500		£ 7,900,000
Add: debt premium			16,200		12,100,000
Gain recognized on redemption of notes from premium paid			5,700		£ 4,300,000
Long-term debt fair value												$ 284,200
Three-Month EURIBOR \| Secured Debt \| Senior Secured Cabot Floating Rate Notes
Debt Instrument [Line Items]
Basis spread on variable rate		5.875%
Interest Income \| Cabot Senior Secured Notes
Debt Instrument [Line Items]
Interest income—accretion of debt premium			(2,865)	(8,951)
Interest expense \| Cabot Senior Secured Notes
Debt Instrument [Line Items]
Interest income—accretion of debt premium			$ 467	$ 620