Condensed Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 40,757	$ 58,719	$ 75,269	$ 72,390
Trade receivables, net of allowance for doubtful accounts	48,306	44,270
Prepaid expenses and other current assets	5,697	5,939
Total current assets	94,760	108,928
Property and equipment, net	61,923	65,226
Intangible assets subject to amortization, net	23,067	24,598
Intangible assets not subject to amortization	220,701	220,701
Goodwill	36,647	36,647
Investment in subsidiaries
Other assets	9,845	11,221
Total assets	446,943	467,321
Current liabilities
Advances payable, related parties	118	118
Accounts payable and accrued expenses	37,466	39,750
Total current liabilities	37,584	39,868
Long-term debt, less current maturities	360,155	379,662
Other long-term liabilities	7,666	8,327
Deferred income taxes	42,430	40,025
Total liabilities	447,835	467,882
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	939,451	938,453
Accumulated deficit	(940,351)	(939,022)
Total stockholders' equity (deficit)	(892)	(561)
Total liabilities and stockholders' equity (deficit)	446,943	467,321
Class A common stock [Member]
Stockholders' equity (deficit)
Common stock	5	5
Class B common stock [Member]
Stockholders' equity (deficit)
Common stock	2	2
Class U common stock [Member]
Stockholders' equity (deficit)
Common stock	1	1
Parent [Member]
Current assets
Cash and cash equivalents	40,492	58,276	75,101	72,140
Trade receivables, net of allowance for doubtful accounts	47,900	43,951
Prepaid expenses and other current assets	5,506	5,678
Total current assets	93,898	107,905
Property and equipment, net	59,101	62,046
Intangible assets subject to amortization, net	23,067	24,598
Intangible assets not subject to amortization	38,739	38,739
Goodwill	35,653	35,653
Investment in subsidiaries	168,545	170,580
Other assets	9,845	11,221
Total assets	428,848	450,742
Current liabilities
Advances payable, related parties	118	118
Accounts payable and accrued expenses	47,634	49,633
Total current liabilities	47,752	49,751
Long-term debt, less current maturities	360,155	379,662
Other long-term liabilities	7,666	8,327
Deferred income taxes	14,167	13,563
Total liabilities	429,740	451,303
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	939,451	938,453
Accumulated deficit	(940,351)	(939,022)
Total stockholders' equity (deficit)	(892)	(561)
Total liabilities and stockholders' equity (deficit)	428,848	450,742
Parent [Member] | Class A common stock [Member]
Stockholders' equity (deficit)
Common stock	5	5
Parent [Member] | Class B common stock [Member]
Stockholders' equity (deficit)
Common stock	2	2
Parent [Member] | Class U common stock [Member]
Stockholders' equity (deficit)
Common stock	1	1
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents
Trade receivables, net of allowance for doubtful accounts
Prepaid expenses and other current assets
Total current assets
Property and equipment, net
Intangible assets subject to amortization, net
Intangible assets not subject to amortization	178,262	178,262
Goodwill
Investment in subsidiaries
Other assets
Total assets	178,262	178,262
Current liabilities
Advances payable, related parties
Accounts payable and accrued expenses
Total current liabilities
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes	30,272	28,252
Total liabilities	30,272	28,252
Stockholders' equity (deficit)
Member's capital	804,654	804,654
Additional paid-in capital
Accumulated deficit	(656,664)	(654,644)
Total stockholders' equity (deficit)	147,990	150,010
Total liabilities and stockholders' equity (deficit)	178,262	178,262
Guarantor Subsidiaries [Member] | Class A common stock [Member]
Stockholders' equity (deficit)
Common stock
Guarantor Subsidiaries [Member] | Class B common stock [Member]
Stockholders' equity (deficit)
Common stock
Guarantor Subsidiaries [Member] | Class U common stock [Member]
Stockholders' equity (deficit)
Common stock
Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	265	443	168	443
Trade receivables, net of allowance for doubtful accounts	406	319
Prepaid expenses and other current assets	191	261
Total current assets	862	1,023
Property and equipment, net	2,822	3,180
Intangible assets subject to amortization, net
Intangible assets not subject to amortization	3,700	3,700
Goodwill	994	994
Investment in subsidiaries
Other assets	12,807	12,603
Total assets	21,185	21,500
Current liabilities
Advances payable, related parties
Accounts payable and accrued expenses	630	930
Total current liabilities	630	930
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes
Total liabilities	630	930
Stockholders' equity (deficit)
Member's capital		12,652
Additional paid-in capital	12,652
Accumulated deficit	7,903	7,918
Total stockholders' equity (deficit)	20,555	20,570
Total liabilities and stockholders' equity (deficit)	21,185	21,500
Non-Guarantor Subsidiaries [Member] | Class A common stock [Member]
Stockholders' equity (deficit)
Common stock
Non-Guarantor Subsidiaries [Member] | Class B common stock [Member]
Stockholders' equity (deficit)
Common stock
Non-Guarantor Subsidiaries [Member] | Class U common stock [Member]
Stockholders' equity (deficit)
Common stock
Eliminations [Member]
Current assets
Cash and cash equivalents
Trade receivables, net of allowance for doubtful accounts
Prepaid expenses and other current assets
Total current assets
Property and equipment, net
Intangible assets subject to amortization, net
Intangible assets not subject to amortization
Goodwill
Investment in subsidiaries	(168,545)	(170,580)
Other assets	(12,807)	(12,603)
Total assets	(181,352)	(183,183)
Current liabilities
Advances payable, related parties
Accounts payable and accrued expenses	(10,798)	(10,813)
Total current liabilities	(10,798)	(10,813)
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes	(2,009)	(1,790)
Total liabilities	(12,807)	(12,603)
Stockholders' equity (deficit)
Member's capital	(804,654)	(817,306)
Additional paid-in capital	(12,652)
Accumulated deficit	648,761	646,726
Total stockholders' equity (deficit)	(168,545)	(170,580)
Total liabilities and stockholders' equity (deficit)	(181,352)	(183,183)
Eliminations [Member] | Class A common stock [Member]
Stockholders' equity (deficit)
Common stock
Eliminations [Member] | Class B common stock [Member]
Stockholders' equity (deficit)
Common stock
Eliminations [Member] | Class U common stock [Member]
Stockholders' equity (deficit)
Common stock