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Convertible Senior Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jul. 26, 2018	Dec. 31, 2017	Jun. 30, 2014	Jul. 31, 2013
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	$ 146,436		$ 156,647
Convertible senior notes, debt issuance costs	1,380		2,075
Convertible senior notes, net of debt issuance costs	145,056		154,572
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount			21,178		$ 100,000
Convertible senior notes, debt issuance costs			103
Convertible senior notes, net of debt issuance costs			21,075
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	33,436	$ 8,000	22,469
Convertible senior notes, net of debt issuance costs	33,436		22,469
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	113,000		113,000	$ 115,000
Convertible senior notes, debt issuance costs	1,380		1,972
Convertible senior notes, net of debt issuance costs	$ 111,620		$ 111,028

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

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-Publisher FASB
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-Topic 835
-SubTopic 30
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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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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