Results of Operations for Businesses Being Sold (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
REVENUES	$ 445,369	$ 267,785	$ 836,353	$ 519,744
COSTS AND EXPENSES:
Direct operating expenses	290,620	196,171	562,420	385,373
Depreciation and amortization	39,852	32,478	79,775	65,802
General and administrative expenses	55,003	44,866	107,782	83,893
Other, net	(7,319)	467	(9,704)	(776)
Income tax (expense) benefit	(20,812)	5,888	(11,629)	13,596
Income (loss) from discontinued operations		8,182		10,077
Segment, Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
REVENUES		71,244		121,356
COSTS AND EXPENSES:
Direct operating expenses		53,540		95,258
Depreciation and amortization		3,379		6,758
General and administrative expenses		1,996		3,921
Other, net		(165)		(187)
Total costs and expenses, net		58,750		105,750
Income before taxes		12,494		15,606
Income tax (expense) benefit		(4,312)		(5,529)
Income (loss) from discontinued operations		$ 8,182		$ 10,077