Details of One Point Five Zero Percent Convertible Notes Reflected on Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long term debt	[1]	$ 1,290,064	$ 1,449,392
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Equity component carrying amount		48,767	49,931
Unamortized discount		21,014	42,547
Long term debt	[2]	$ 274,036	$ 357,453

[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.

[2] During the Current Nine Months, the Company repurchased a total of $104.9 million par value (of which $51.7 million and $53.2 million were purchased in June 2016 and July 2016, respectively) of the 1.50% Convertible Notes. See below for further details.