Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
REVENUES	$ 404,222	$ 416,723
EXPENSES:
Operating	287,380	298,222
General and administrative	25,392	31,232
Depreciation and amortization	28,384	27,377
Costs and Expenses	341,156	356,831
Operating income	63,066	59,892
OTHER (INCOME) EXPENSE:
Interest expense, net	10,348	12,566
Expenses associated with debt refinancing transactions		225
Other (income) expense	(387)	101
Total non-operating expense (income)	9,961	12,892
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	53,105	47,000
Income tax benefit (expense)	(1,367)	134,447
INCOME FROM CONTINUING OPERATIONS	51,738	181,447
Loss from discontinued operations, net of taxes		(355)
NET INCOME	51,738	181,092
Parent
Condensed Financial Statements, Captions [Line Items]
REVENUES	306,248	313,437
EXPENSES:
Operating	219,705	234,660
General and administrative	8,676	9,609
Depreciation and amortization	19,769	18,651
Costs and Expenses	248,150	262,920
Operating income	58,098	50,517
OTHER (INCOME) EXPENSE:
Interest expense, net	8,602	10,095
Expenses associated with debt refinancing transactions		177
Other (income) expense	(38)	321
Total non-operating expense (income)	8,564	10,593
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	49,534	39,924
Income tax benefit (expense)	(220)	138,211
INCOME FROM CONTINUING OPERATIONS	49,314	178,135
Income from equity in subsidiaries	2,424	2,957
NET INCOME	51,738	181,092
Combined Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
REVENUES	311,247	332,993
EXPENSES:
Operating	280,948	293,269
General and administrative	16,716	21,623
Depreciation and amortization	8,615	8,726
Costs and Expenses	306,279	323,618
Operating income	4,968	9,375
OTHER (INCOME) EXPENSE:
Interest expense, net	1,746	2,471
Expenses associated with debt refinancing transactions		48
Other (income) expense	(79)	(201)
Total non-operating expense (income)	1,667	2,318
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	3,301	7,057
Income tax benefit (expense)	(1,147)	(3,764)
INCOME FROM CONTINUING OPERATIONS	2,154	3,293
Loss from discontinued operations, net of taxes		(355)
NET INCOME	2,154	2,938
Consolidating Adjustments and Other
Condensed Financial Statements, Captions [Line Items]
REVENUES	(213,273)	(229,707)
EXPENSES:
Operating	(213,273)	(229,707)
Costs and Expenses	(213,273)	(229,707)
OTHER (INCOME) EXPENSE:
Other (income) expense	(270)	(19)
Total non-operating expense (income)	(270)	(19)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	270	19
INCOME FROM CONTINUING OPERATIONS	270	19
Income from equity in subsidiaries	(2,424)	(2,957)
NET INCOME	$ (2,154)	$ (2,938)