Line of Credit Facility, Covenant Terms, Loan-to-Value Credit Facility Utilization Trigger

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

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
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: 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

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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

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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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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- Details

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- Details

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- Details

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- Details

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Debt - Cabot Senior Revolving Credit Facility (Details)	3 Months Ended		9 Months Ended
Debt - Cabot Senior Revolving Credit Facility (Details)	Sep. 30, 2017 USD ($)	Sep. 30, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016	Sep. 30, 2017 GBP (£)	Dec. 31, 2016 USD ($)	Dec. 20, 2016 USD ($)	Sep. 20, 2012 USD ($)	Sep. 20, 2012 GBP (£)
Cabot Credit Agreement
Debt Instrument [Line Items]
Revolving credit facility								$ 82,700,000	£ 50,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility \| $							$ 826,700,000.0
Credit facility, outstanding amount \| $	$ 149,563,000		$ 149,563,000			$ 578,000,000
Weighted average interest rate (percent)	4.32%	3.58%	3.99%	3.52%
Revolving Credit Facility \| Secured Debt \| Cabot Credit Agreement
Debt Instrument [Line Items]
Revolving credit facility								$ 316,200,000	250,000,000
Line of credit facility, increase to maximum borrowing capacity, accordion provision \| £									£ 50,000,000
Loan-to-value credit facility utilization trigger (more than)			20.00%
Revolving Credit Facility \| Secured Debt \| Cabot Credit Agreement \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			3.25%
Revolving Credit Facility \| Secured Debt \| Cabot Credit Agreement, Tranche with Expiration in September 2019
Debt Instrument [Line Items]
Revolving credit facility \| £					£ 200,000,000.0
Revolving Credit Facility \| Secured Debt \| Cabot Credit Agreement, Tranche with Expiration in March 2022
Debt Instrument [Line Items]
Revolving credit facility \| £					£ 50,000,000.0
Revolving Credit Facility \| Senior Loans \| Cabot Credit Agreement
Debt Instrument [Line Items]
Loan-to-value credit facility utilization trigger (more than)			20.00%
Cabot credit facility
Debt Instrument [Line Items]
Maximum loan to value ratio			75.00%
Credit facility, outstanding amount \| $	$ 75,693,000		$ 75,693,000			$ 33,218,000
Weighted average interest rate (percent)	3.50%	3.89%	3.51%	3.97%
Cabot credit facility \| Senior Loans
Debt Instrument [Line Items]
Maximum loan to value ratio			25.00%