Debt Instrument, Discount Rate

No definition available.

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- Definition

Line of Credit Facility, Increase to Maximum Borrowing Capacity, Accordion Provision

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum Loan To Value Ratio

+ References

No definition available.

+ Details

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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
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- 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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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

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-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

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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

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

+ References

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-Paragraph 3
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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=26872669&loc=d3e20235-122688

+ Details

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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
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
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+ Details

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Balance Type:	credit
Period Type:	instant

- 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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Balance Type:	credit
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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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- Definition

The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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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
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Debt - Cabot Senior Debt (Details) $ in Thousands					12 Months Ended
Debt - Cabot Senior Debt (Details) $ in Thousands	Nov. 11, 2015 GBP (£)	Nov. 11, 2015 USD ($)	Mar. 27, 2014 GBP (£)	Mar. 27, 2014 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Nov. 11, 2015 USD ($)	Nov. 11, 2015 EUR (€)	Mar. 27, 2014 USD ($)	Aug. 02, 2013 GBP (£)	Aug. 02, 2013 USD ($)	Jul. 25, 2013 GBP (£)	Jul. 25, 2013 USD ($)	Sep. 20, 2012 GBP (£)	Sep. 20, 2012 USD ($)
Debt Instrument [Line Items]
Senior secured notes							$ 43,750		$ 28,750
Debt discount							51,202		41,867
Repayment of senior credit facility						$ 891,804	1,184,244	$ 630,163
Credit facility, outstanding amount							$ 505,000		627,000
Weighted average interest rate					3.17%	3.17%	2.93%
Cabot Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity																	£ 50,000,000.0	$ 82,700
Cabot Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, increase to maximum borrowing capacity, accordion provision \| £	£ 50,000,000
Debt issuance costs	£ 4,800,000	$ 7,200
Debt instrument, term	6 years	6 years
Line of credit facility expiry date	Sep. 01, 2018	Sep. 01, 2018
LTV ratio	0.75%	0.75%
Credit facility, outstanding amount							$ 86,368		54,089
Weighted average interest rate					3.86%	3.86%	4.34%
Cabot Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%	3.50%
Senior Secured Cabot Floating Rate Notes [Member]
Debt Instrument [Line Items]
Debt issuance cost					£ 5,800,000				8,700
Cabot Senior Secured Notes [Member]
Debt Instrument [Line Items]
Interest expense—stated coupon rate						$ 98,988	$ 97,028
Total interest expense						88,316	86,795
Cabot Corporation [Member]
Debt Instrument [Line Items]
Repayment of senior credit facility					75,000,000	113,800
Cabot 2019 Notes [Member]
Debt Instrument [Line Items]
Senior secured notes																	£ 265,000,000	$ 438,400
Debt instrument, interest rate																	10.375%	10.375%
Cabot 2020 Notes [Member]
Debt Instrument [Line Items]
Senior secured notes													£ 100,000,000	$ 151,700
Debt instrument, interest rate													8.375%	8.375%
J Bridge PECs [Member]
Debt Instrument [Line Items]
Repayment of J Bridge PECs					£ 25,000,000	37,900
Cabot 2021 Notes [Member]
Debt Instrument [Line Items]
Senior secured notes			£ 175,000,000.0									$ 291,800
Debt instrument, interest rate			6.50%									6.50%
Repayment of senior credit facility			£ 105,000,000	$ 174,800
Debt issuance costs				$ 7,500
Secured Debt [Member] \| Senior Secured Cabot Floating Rate Notes [Member]
Debt Instrument [Line Items]
Senior secured notes										$ 332,200	€ 310,000,000.0
Debt Instrument, Discount Rate	1.00%	1.00%
Debt discount										3,400	€ 3,100,000
Secured Debt [Member] \| Senior Secured Cabot Floating Rate Notes [Member] \| Three-Month EURIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	5.875%	5.875%
Secured Debt [Member] \| Cabot Senior Secured Notes [Member]
Debt Instrument [Line Items]
Senior secured notes							1,144,200		$ 1,400,000
Secured Debt [Member] \| Cabot Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	£ 200,000,000									$ 304,000
Ten Point Five Percent Senior Secured Notes Due Two Thousand Twenty [Member] \| Marlin [Member]
Debt Instrument [Line Items]
Senior secured notes															£ 150,000,000.0	$ 246,500
Debt instrument, interest rate															10.50%	10.50%
Long-term debt, fair value																$ 284,200
Senior Loans [Member] \| Cabot Credit Facility [Member]
Debt Instrument [Line Items]
LTV ratio	25.00%	25.00%
Interest Income [Member] \| Cabot Senior Secured Notes [Member]
Debt Instrument [Line Items]
Interest income—accretion of debt premium						(10,747)	(10,233)
Interest Expense [Member] \| Cabot Senior Secured Notes [Member]
Debt Instrument [Line Items]
Interest income—accretion of debt premium						$ 75	$ 0