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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	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long term debt, face amount						$ 156,647			$ 156,647	$ 156,647	$ 206,865
Gain recognized on retirement of debt										(919)
Payment for repurchase of convertible notes										35,614	8,035
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount				$ 115,000		$ 113,000			$ 113,000	$ 113,000	$ 113,000
Debt instrument, interest rate				4.875%		4.875%			4.875%	4.875%	4.875%
Debt instrument, maturity date				Jun. 01, 2020
Frequency of interest payment									semi-annually	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						$ 89,700			$ 89,700	$ 89,700	$ 89,300
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount					$ 100,000	$ 22,469			$ 22,469	$ 22,469
Debt instrument, interest rate					4.25%	4.25%			4.25%	4.25%	4.25%
Debt instrument, maturity date					Aug. 01, 2018					Nov. 01, 2020
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				$ 51,100	$ 12,000	$ 39,100	$ 51,100	$ 51,100	$ 6,100
Write-off of debt issuance costs							100				100
Gain recognized on retirement of debt							100			(497)	98
Payment for repurchase of convertible notes							11,600	24,100		35,600
Convertible senior note payable, fair value						20,500			20,500	$ 20,500	18,900
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		3,000,000
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount						$ 21,178			$ 21,178	$ 21,178	$ 93,865
Debt instrument, interest rate						3.25%			3.25%	3.25%	3.25%
Debt instrument, conversion rate						$ 3.05			$ 3.05	$ 3.05
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						(300)
Convertible senior note payable, fair value						$ 22,500			$ 22,500	$ 22,500

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