Company's Debt Maturities on Calendar Year Basis (Detail) $ in Thousands	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Total	$ 1,457,111
April 1 through December 31, 2016	343,454
2017	61,123
2018	522,996
2019	61,123
2020	61,123
Thereafter	407,292
Senior Secured Notes
Debt Instrument [Line Items]
Total	697,626
April 1 through December 31, 2016	45,842
2017	61,123
2018	61,123
2019	61,123
2020	61,123
Thereafter	407,292
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total	361,873	[1]
2018	361,873	[1]
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016
Debt Instrument [Line Items]
Total	297,612	[2],[3]
April 1 through December 31, 2016	297,612	[2],[3]
Variable Funding Notes
Debt Instrument [Line Items]
Total	100,000
2018	$ 100,000

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the condensed consolidated balance sheet as of March 31, 2016, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 1.50% Convertible Notes is $400.0 million.

[2] In March 2016, the Company entered in to a long-term refinancing arrangement with CF ICX LLC and Fortress Credit Co LLC for an aggregate principal amount of $300 million (see above under “Secured Senior Term Loan” for further details) the proceeds of which are to be used to pay off the 2.50% Convertible Notes. In accordance with ASC 470, as the terms of the refinancing are readily determinable and the term of the credit agreement is five years (scheduled to mature on March 7, 2021), the Company has classified the 2.50% Convertible Notes as long-term debt on its March 31, 2016 condensed consolidated balance sheet.

[3] Reflects the net debt carrying amount of the 2.50% Convertible Notes in the condensed consolidated balance sheet as of March 31, 2016, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 2.50% Convertible Notes is $300.0 million.