Details of One Point Five Zero Percent Convertible Notes Reflected on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, including current portion, Carrying Amount	[1]	$ 1,254,160	$ 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		17,531	42,547
Long-term debt, including current portion, Carrying Amount	[2]	$ 277,518	$ 357,453

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

[2] During FY 2016, 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.