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Equity and Liability Components of Notes (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized discount and fees of liability component	$ (7,419)	$ (3,164)
Less: current portion	(46,081)	(2,468)
Long-term debt	504,620	233,465
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of the Notes outstanding	44,841	48,951
Unamortized discount and fees of liability component	(898)	(2,183)
Net carrying amount of liability component	43,943	46,768
Less: current portion	(43,943)	0
Long-term debt	0	46,768
Carrying value of equity component, net of issuance costs	$ (7,373)	$ (3,971)
Remaining amortization period of discount on the liability component	7 months 6 days	1 year 3 months 18 days

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Amount, after accumulated amortization, of debt discount.

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