Components of Company's Debt (Detail) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Long term debt	$ 640,672		$ 584,387
2.50% Convertible Notes
Debt Instrument [Line Items]
Long term debt	237,521	[1]
1.875% Convertible Notes
Debt Instrument [Line Items]
Long term debt	270,409	[2]	262,716
Ecko Note
Debt Instrument [Line Items]
Long term debt	75,000		80,000
Asset-Backed Notes
Debt Instrument [Line Items]
Long term debt	57,742		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 June 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 June 30, 2011, in accordance with accounting for convertible notes. The principal amount owed to the holders of the Convertible Notes is $287.5 million.