Accounts Payable And Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Trade payables	$ 51,303	$ 69,894
Salaries and other payroll costs	10,423	10,174
Customer advances	9,592	4,900
Accrued interest	9,110	9,273
Income tax payable	1,467	1,464
Property tax	4,399	3,323
Scheduling and transmission	594	1,059
Royalty	1,646	1,065
Other	9,467	3,960
Total	$ 98,001	$ 105,112