Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jan. 28, 2011
Debt Instrument [Line Items]
Total Debt	$ 565,004	$ 587,561
Current portion, long-term debt	30,000	22,500
Long-term debt	535,004	565,061
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	35,000	50,000
Senior Secured Term Loan A
Debt Instrument [Line Items]
Total Debt	270,000	277,500
Senior Secured Convertible Notes due 2033, net of discount
Debt Instrument [Line Items]
Total Debt	4	61
Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%	6.625%
Total Debt		260,000
Debt Instrument, Face Amount			$ 260,000