Condensed Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 45,238	$ 58,719	$ 68,979	$ 72,390
Trade receivables, net of allowance for doubtful accounts	48,059	44,270
Prepaid expenses and other current assets	6,876	5,939
Total current assets	100,173	108,928
Property and equipment, net	62,063	65,226
Intangible assets subject to amortization, net	22,457	24,598
Intangible assets not subject to amortization	220,701	220,701
Goodwill	36,647	36,647
Investment in subsidiaries
Other assets	9,466	11,221
Total assets	451,507	467,321
Current liabilities
Advances payable, related parties	118	118
Accounts payable, accrued expenses and other liabilities	32,382	39,750
Total current liabilities	32,500	39,868
Long-term debt, less current maturities	360,299	379,662
Other long-term liabilities	8,070	8,327
Deferred income taxes	43,510	40,025
Total liabilities	444,379	467,882
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	940,238	938,453
Accumulated deficit	(933,118)	(939,022)
Total stockholders' equity (deficit)	7,128	(561)
Total liabilities and stockholders' equity (deficit)	451,507	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	45,017	58,276		72,140
Trade receivables, net of allowance for doubtful accounts	47,939	43,951
Prepaid expenses and other current assets	6,669	5,678
Total current assets	99,625	107,905
Property and equipment, net	59,377	62,046
Intangible assets subject to amortization, net	22,457	24,598
Intangible assets not subject to amortization	38,739	38,739
Goodwill	35,653	35,653
Investment in subsidiaries	167,512	170,580
Other assets	9,466	11,221
Total assets	432,829	450,742
Current liabilities
Advances payable, related parties	118	118
Accounts payable, accrued expenses and other liabilities	42,976	49,633
Total current liabilities	43,094	49,751
Long-term debt, less current maturities	360,299	379,662
Other long-term liabilities	8,070	8,327
Deferred income taxes	14,238	13,563
Total liabilities	425,701	451,303
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	940,238	938,453
Accumulated deficit	(933,118)	(939,022)
Total stockholders' equity (deficit)	7,128	(561)
Total liabilities and stockholders' equity (deficit)	432,829	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, accrued expenses and other liabilities
Total current liabilities
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes	31,281	28,252
Total liabilities	31,281	28,252
Stockholders' equity (deficit)
Member's capital	804,654	804,654
Additional paid-in capital
Accumulated deficit	(657,673)	(654,644)
Total stockholders' equity (deficit)	146,981	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	221	443		250
Trade receivables, net of allowance for doubtful accounts	120	319
Prepaid expenses and other current assets	207	261
Total current assets	548	1,023
Property and equipment, net	2,686	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	13,242	12,603
Total assets	21,170	21,500
Current liabilities
Advances payable, related parties
Accounts payable, accrued expenses and other liabilities	639	930
Total current liabilities	639	930
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes
Total liabilities	639	930
Stockholders' equity (deficit)
Member's capital	12,652	12,652
Additional paid-in capital
Accumulated deficit	7,879	7,918
Total stockholders' equity (deficit)	20,531	20,570
Total liabilities and stockholders' equity (deficit)	21,170	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	(167,512)	(170,580)
Other assets	(13,242)	(12,603)
Total assets	(180,754)	(183,183)
Current liabilities
Advances payable, related parties
Accounts payable, accrued expenses and other liabilities	(11,233)	(10,813)
Total current liabilities	(11,233)	(10,813)
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes	(2,009)	(1,790)
Total liabilities	(13,242)	(12,603)
Stockholders' equity (deficit)
Member's capital	(817,306)	(817,306)
Additional paid-in capital
Accumulated deficit	649,794	646,726
Total stockholders' equity (deficit)	(167,512)	(170,580)
Total liabilities and stockholders' equity (deficit)	(180,754)	(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