Components of Company's Debt (Detail) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Long term debt	$ 635,602		$ 584,387
2.50% Convertible Notes
Debt Instrument [Line Items]
Long term debt	240,343	[1]
1.875% Convertible Notes
Debt Instrument [Line Items]
Long term debt	274,681	[2]	262,716
Ecko Note
Debt Instrument [Line Items]
Long term debt	69,500		80,000
Asset-Backed Notes
Debt Instrument [Line Items]
Long term debt	51,078		70,650
Term Loan Facility
Debt Instrument [Line Items]
Long term debt			$ 171,021

[1] Reflects the net debt carrying amount of the 2.50% Convertible Notes on the unaudited condensed consolidated balance sheet as of September 30, 2011, in accordance with accounting for convertible notes. The principal amount owed to the holders of the Convertible Notes is $300.0 million.

[2] Reflects the net debt carrying amount of the 1.875% Convertible Notes on the unaudited condensed consolidated balance sheet as of September 30, 2011, in accordance with accounting for convertible notes. The principal amount owed to the holders of the Convertible Notes is $287.5 million.