Borrowings - Components of Debt (Detail) $ in Thousands, £ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Senior secured notes	$ 308,750		$ 325,000
Encore convertible and exchangeable notes	672,855		656,000
Less: debt discount	(30,308)		(36,361)
Other debt	54,151		107,920
Finance lease liabilities	8,121
Finance lease liabilities			7,563
Debt and capital lease obligations, before debt issuance costs	3,554,522		3,537,942
Less: debt issuance costs, net of amortization	(41,325)		(47,309)
Total	3,513,197		3,490,633
Encore revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings for credit facility	492,000		429,000
Cabot senior revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings for credit facility	285,749	£ 215.5	298,005
Cabot securitisation senior facility
Debt Instrument [Line Items]
Outstanding borrowings for credit facility			445,837
Cabot senior secured notes
Debt Instrument [Line Items]
Senior secured notes			1,111,399
Less: debt discount	(1,604)		(1,477)
Term Loan
Debt Instrument [Line Items]
Long-term debt	171,677		$ 195,056
Other debt	$ 171,700

Long-term Debt and Capital Lease Obligations, Including Current Maturities, Gross of Debt Issuances Costs

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount of short-term and long-term debt and lease obligation.

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

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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.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt classified as other.

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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.

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