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Convertible Senior Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2014	Jul. 31, 2013
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	$ 160,078	$ 156,647
Convertible senior notes, debt issuance costs	1,592	2,075
Convertible senior notes, net of debt issuance costs	158,486	154,572
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	21,178	21,178		$ 100,000
Convertible senior notes, debt issuance costs	15	103
Convertible senior notes, net of debt issuance costs	21,163	21,075
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Convertible senior notes, principal\ fair value amount	25,900	22,469
Convertible senior notes, net of debt issuance costs	25,900	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	1,577	1,972
Convertible senior notes, net of debt issuance costs	$ 111,423	$ 111,028

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

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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.

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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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