Debt Facilities - Components of Total Interest Expense Recognized Related to Convertible Subordinated Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Interest charges incurred	$ 541,374	$ 501,323	$ 405,494
Effective interest rate of the liability component (percent)	7.88%
Convertible Subordinated Debt \| 4.75% convertible subordinated notes
Debt Instrument [Line Items]
Contractual interest expense			3,267
Amortization of debt issuance costs			186
Amortization of debt discount			3,775
Interest charges incurred			$ 7,228
Effective interest rate of the liability component (percent)			10.48%

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.

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Amount of amortization expense attributable to debt issuance costs.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Total interest costs incurred during the period and either capitalized or charged against earnings.

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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.

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