Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Total debt	$ 602,560	$ 706,227
Current portion long-term debt	15,000	7,058
Long-term debt	587,560	699,169
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	50,000
Senior Secured Term Loan A
Debt Instrument [Line Items]
Total debt	292,500
Senior Secured Convertible Notes due 2033, net of discount
Debt Instrument [Line Items]
Total debt	60	58
8 1/4% Senior Notes due 2015
Debt Instrument [Line Items]
Total debt		242,224
6 5/8% Senior Notes due 2021
Debt Instrument [Line Items]
Total debt	260,000
Senior Secured Term Loan B
Debt Instrument [Line Items]
Total debt		347,723
Senior Secured Delayed Draw Term Loan
Debt Instrument [Line Items]
Total debt		$ 116,222