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Convertible Senior Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended				9 Months Ended		12 Months Ended
	Aug. 31, 2017	Jun. 30, 2017	Jan. 31, 2016	Jun. 30, 2014	Jul. 31, 2013	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Long term debt, face amount						$ 155,728				$ 155,728		$ 206,865
Gain recognized on retirement of debt										114	$ 69
Payment for repurchase of convertible notes										35,614	2,626
Long term debt						21,500				21,500
Long term debt, current						21,200				21,200
Amortization of debt issuance costs recognized as interest expense						400			$ 400	1,500	$ 1,500
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
Debt instrument repurchase amount			$ 2,000
Write-off of debt issuance costs			100
Gain recognized on retirement of debt			$ 100
Convertible senior note payable, fair value						$ 88,600				$ 88,600		$ 89,300
Debt instrument, maturity year										2020		2020
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount					$ 100,000	$ 42,728				$ 42,728		$ 93,865
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
Debt instrument repurchase amount		$ 12,000					$ 12,000	$ 39,100				$ 6,100
Write-off of debt issuance costs							100					100
Gain recognized on retirement of debt							100
Payment for repurchase of convertible notes							11,600	24,100
Convertible senior note payable, fair value						$ 41,400				$ 41,400		$ 83,700
Debt instrument, maturity year										2018		2018
4.25% Convertible Senior Notes (due 2018) | Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount		$ 11,600					$ 11,600	$ 39,100
Debt instrument shares common stock issued upon conversion		112,400					112,400	2,865,000
After Modification Senior Notes (due 2018) | 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
Long term debt, current						$ 21,200				$ 21,200

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