Company's Debt Maturities on Calendar Year Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Total	$ 475,519		$ 633,389
October 1 through December 31, 2012	6,002
2013	170,802
2014	47,000
2016	251,715
2.50% Convertible Notes
Debt Instrument [Line Items]
Total	251,715	[1]	243,164
2016	251,715	[1]
Revolver
Debt Instrument [Line Items]
Total	150,000
2013	150,000
Ecko Note
Debt Instrument [Line Items]
Total	59,500		67,000
October 1 through December 31, 2012	2,500
2013	10,000
2014	47,000
Asset-Backed Notes
Debt Instrument [Line Items]
Total	14,304		44,270
October 1 through December 31, 2012	3,502
2013	$ 10,802

[1] Reflects the net debt carrying amount of the 2.50% Convertible Notes in the consolidated balance sheet as of September 30, 2012, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 2.50% Convertible Notes is $300.0 million.