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Convertible Senior Notes (Parenthetical) (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Jul. 26, 2018	Jun. 30, 2014	Jul. 31, 2013
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Debt instrument, maturity year	2018	2018
Debt instrument, interest rate	4.25%	4.25%	4.25%		4.25%
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, maturity year	2020	2020
Debt instrument, interest rate	3.25%	3.25%	3.25%
Convertible notes , principal amount	$ 29.5	$ 21.5
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, maturity year	2020	2020
Debt instrument, interest rate	4.875%	4.875%		4.875%

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- Definition

Convertible Debt Principal Amount

+ References

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- Definition

Debt Instrument Maturity Year

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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.

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