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Debt - January 2012, May 2014, and November 2015 Exchangeable Senior Notes - Additional Information (Detail) - Convertible Debt - USD ($)	1 Months Ended
	Mar. 31, 2017	Jan. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
2012 Notes
Debt Disclosure [Line Items]
Convertible senior notes, stated interest rate		3.50%
Convertible senior notes, due date		2032
Convertible senior notes, principal amount purchase		$ 15,000,000
Convertible senior notes, aggregate principal amount redeemed	$ 100,000
Convertible senior notes, outstanding amount					$ 0
2012, 2014 and 2015 Notes
Debt Disclosure [Line Items]
Convertible senior notes, outstanding amount			$ 0	$ 0

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- Definition

Debt disclosure.

+ References

No definition available.

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- Definition

Debt instrument aggregate principal amount redeemed.

+ References

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- Definition

Debt instrument maturity year.

+ References

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- Definition

The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ 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(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- 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

Face (par) amount of the original debt instrument that was repurchased.

+ References

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