Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
REVENUES	$ 431,103	[1]	$ 421,466	[1]	$ 425,005	[1]	$ 416,723	[1]	$ 427,677	[1]	$ 435,727	[1]	$ 433,897	[1]	$ 426,356	[1]	$ 1,694,297	$ 1,723,657	$ 1,688,805
EXPENSES:
Operating																	1,220,351	1,217,051	1,158,269
General and administrative																	103,590	88,935	91,227
Depreciation and amortization																	112,692	113,063	107,568
Asset impairments																	6,513
Costs and Expenses																	1,443,146	1,419,049	1,357,064
Operating income	56,019	[1]	67,271	[1]	67,969	[1]	59,892	[1]	80,299	[1]	79,733	[1]	75,125	[1]	69,451	[1]	251,151	304,608	331,741
OTHER (INCOME) EXPENSE:
Interest expense, net																	45,126	58,363	72,940
Expenses associated with debt refinancing transactions																	36,528	2,099
Other (income) expense																	(100)	(333)	305
Total non-operating expense (income)																	81,554	60,129	73,245
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES																	169,597	244,479	258,496
Income tax benefit (expense)																	134,995	(87,513)	(96,166)
INCOME (LOSS) FROM CONTINUING OPERATIONS																	304,592	156,966	162,330
Loss from discontinued operations, net of taxes			(663)	[1]	(2,739)	[1]	(355)	[1]	150	[1]	99	[1]	(150)	[1]	(304)	[1]	(3,757)	(205)	180
NET INCOME	47,471	[1]	51,843	[1]	20,429	[1]	181,092	[1]	45,408		42,339		37,334		31,680		300,835	156,761	162,510
Parent
Condensed Financial Statements, Captions [Line Items]
REVENUES																	1,268,763	1,411,277
EXPENSES:
Operating																	945,750	943,803
General and administrative																	31,290	70,792
Depreciation and amortization																	76,112	74,452
Costs and Expenses																	1,053,152	1,089,047
Operating income																	215,611	322,230
OTHER (INCOME) EXPENSE:
Interest expense, net																	38,319	57,174
Expenses associated with debt refinancing transactions																	28,563	2,099
Other (income) expense																	(45)	16
Total non-operating expense (income)																	66,837	59,289
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES																	148,774	262,941
Income tax benefit (expense)																	143,590	(93,870)
INCOME (LOSS) FROM CONTINUING OPERATIONS																	292,364	169,071
Income from equity in subsidiaries																	8,471	(12,310)
NET INCOME																	300,835	156,761
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
REVENUES																	1,351,695	329,971
EXPENSES:
Operating																	1,200,762	290,839
General and administrative																	72,300	18,143
Depreciation and amortization																	36,580	38,611
Asset impairments																	6,513
Costs and Expenses																	1,316,155	347,593
Operating income																	35,540	(17,622)
OTHER (INCOME) EXPENSE:
Interest expense, net																	6,807	1,189
Expenses associated with debt refinancing transactions																	7,965
Other (income) expense																	23	(26)
Total non-operating expense (income)																	14,795	1,163
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES																	20,745	(18,785)
Income tax benefit (expense)																	(8,595)	6,357
INCOME (LOSS) FROM CONTINUING OPERATIONS																	12,150	(12,428)
Loss from discontinued operations, net of taxes																	(3,757)	(205)
NET INCOME																	8,393	(12,633)
Consolidating Adjustments and Other
Condensed Financial Statements, Captions [Line Items]
REVENUES																	(926,161)	(17,591)
EXPENSES:
Operating																	(926,161)	(17,591)
Costs and Expenses																	(926,161)	(17,591)
OTHER (INCOME) EXPENSE:
Other (income) expense																	(78)	(323)
Total non-operating expense (income)																	(78)	(323)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES																	78	323
INCOME (LOSS) FROM CONTINUING OPERATIONS																	78	323
Income from equity in subsidiaries																	(8,471)	12,310
NET INCOME																	$ (8,393)	$ 12,633

[1] The amounts presented for the first two quarters of 2013 and the four quarters of 2012 are not equal to the same amounts previously reported in the respective reports on Form 10-Q and Form 10-K for each period as a result of discontinued operations. Below is a reconciliation to the previously reported amounts in Form 10-Q.