Subsequent Events - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
	Apr. 04, 2016	Apr. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Mar. 18, 2013	May. 23, 2011
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage			1.50%	1.50%	1.50%	1.50%
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage			2.50%	2.50%	2.50%		2.50%
Subsequent Event
Subsequent Event [Line Items]
Net proceeds received from issuance of debt	$ 265,100,000
Subsequent Event | Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage	1.50%
Subsequent Event | Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage	2.50%	2.50%
Debt instrument, repurchase amount		$ 145,300,000
Debt instrument, aggregate amount		143,900,000
Accrued and unpaid interest		1,400,000
Brokerage fees		$ 400,000
Galore
Subsequent Event [Line Items]
Preferred Stock, Participation Rights			The Series A Preferred Stock carries voting rights, and the holders of the Series A Preferred Stock have the collective right to appoint one of five members of the Board of Directors as long as there are at least 48,000 Series A Preferred Shares outstanding.
Galore | Series A Preferred Stock
Subsequent Event [Line Items]
Marketing Service to be purchased in FY 2016			$ 500,000
Galore | Subsequent Event
Subsequent Event [Line Items]
Investment owned		11.00%
Galore | Subsequent Event | Series A Preferred Stock
Subsequent Event [Line Items]
Shares purchased		50,050
Shares purchased, value		$ 500,000