Long-term debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Senior notes	$ 4,500,000	$ 4,500,000
Acquisition obligations and other notes payable	167,779	150,512
Capital lease obligations	289,333	297,170
Total debt principal outstanding	10,278,362	9,400,182
Discount and deferred financing costs	(53,624)	(63,951)
Total amount of long-term debt	10,224,738	9,336,231
Less current portion	(1,784,065)	(178,213)
Long-term debt	8,440,673	9,158,018
Term Loan A
Debt Instrument [Line Items]
Senior Secured Credit Facilities	700,000	775,000
Term Loan A-2
Debt Instrument [Line Items]
Senior Secured Credit Facilities	995,000	0
Term Loan B
Debt Instrument [Line Items]
Senior Secured Credit Facilities	3,351,250	3,377,500
Revolver
Debt Instrument [Line Items]
Senior Secured Credit Facilities	$ 275,000	$ 300,000

This represents deferred purchase price obligations associated with acquisitions as well as other notes payable.

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Discount and deferred finance 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, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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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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