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Convertible Senior Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended			6 Months Ended		12 Months Ended
	Aug. 31, 2017	Jun. 30, 2017	Jan. 31, 2016	Jun. 30, 2014	Jul. 31, 2013	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs recognized as interest expense						$ 200	$ 800		$ 500	$ 1,100
Long term debt, face amount						160,078			160,078			$ 156,647
Gain recognized on retirement of debt										114
Payment for repurchase of convertible notes										35,614
Unrealized loss related to a fair market value adjustment						(2,410)			(3,431)
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount				$ 115,000		$ 113,000			$ 113,000			$ 113,000
Debt instrument, interest rate				4.875%		4.875%			4.875%			4.875%
Debt instrument, maturity date				Jun. 01, 2020
Frequency of interest payment									semi-annually
Conversion rate in share per $1000 principal amount of notes				103.7613
Debt instrument, conversion rate				$ 9.64
Write-off of debt issuance costs			$ 100
Debt instrument repurchase amount			2,000
Gain recognized on retirement of debt			$ 100
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount					$ 100,000	$ 21,178			$ 21,178			$ 21,178
Debt instrument, interest rate					4.25%	4.25%			4.25%			4.25%
Debt instrument, maturity date					Aug. 01, 2018
Frequency of interest payment									semi-annually
Conversion rate in share per $1000 principal amount of notes					114.3674
Debt instrument, conversion rate					$ 8.74
Write-off of debt issuance costs							100				$ 100
Debt instrument repurchase amount		$ 12,000					12,000	$ 39,100		12,000	$ 6,100
Gain recognized on retirement of debt							100
Payment for repurchase of convertible notes							11,600	$ 24,100
4.25% Convertible Senior Notes (due 2018) | Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount		$ 11,600				$ 39,100	$ 11,600		$ 39,100	$ 11,600
Debt instrument shares common stock issued upon conversion		112,400					112,400	2,900,000	2,865,000
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount						$ 25,900			$ 25,900			$ 22,469
Debt instrument, interest rate						3.25%			3.25%			3.25%
3.25% Convertible Senior Notes (due 2020) | Oasis Management and Oasis Investments ll Master Fund Ltd.
Debt Instrument [Line Items]
Long term debt, face amount	$ 21,500
Debt instrument, interest rate	3.25%
Debt instrument, maturity date	Nov. 01, 2020
Conversion rate in share per $1000 principal amount of notes	328.0302
Gain recognized on retirement of debt									$ 600
Unrealized loss related to a fair market value adjustment						$ (2,400)			(3,400)
Convertible senior note payable, fair value						$ 25,900			$ 25,900			$ 22,500

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