Condensed Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 41,066	$ 36,130	$ 40,757	$ 58,719
Trade receivables, net of allowance for doubtful accounts	52,417	48,030
Prepaid expenses and other current assets	4,473	4,245
Total current assets	97,956	88,405
Property and equipment, net	59,170	61,435
Intangible assets subject to amortization, net	21,080	22,349
Intangible assets not subject to amortization	220,701	220,701
Goodwill	36,647	36,647
Investment in subsidiaries
Other assets	13,002	8,514
Total assets	448,556	438,051
Current liabilities
Current maturities of long-term debt	200	150
Advances payable, related parties	118	118
Accounts payable and accrued expenses	37,824	39,158
Total current liabilities	38,142	39,426
Long-term debt, less current maturities	340,835	340,664
Other long-term liabilities	6,934	7,359
Deferred income taxes	48,495	45,201
Total liabilities	434,406	432,650
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	935,446	930,814
Accumulated deficit	(921,305)	(925,421)
Total stockholders' equity (deficit)	14,150	5,401
Total liabilities and stockholders' equity (deficit)	448,556	438,051
Class A common stock [Member]
Stockholders' equity (deficit)
Common stock	6	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	40,748	35,631	40,492	58,276
Trade receivables, net of allowance for doubtful accounts	52,137	47,779
Prepaid expenses and other current assets	3,854	3,778
Total current assets	96,739	87,188
Property and equipment, net	56,478	58,900
Intangible assets subject to amortization, net	21,080	22,349
Intangible assets not subject to amortization	38,739	38,739
Goodwill	35,653	35,653
Investment in subsidiaries	160,895	164,355
Other assets	13,002	8,514
Total assets	422,586	415,698
Current liabilities
Current maturities of long-term debt	200	150
Advances payable, related parties	118	118
Accounts payable and accrued expenses	46,285	47,537
Total current liabilities	46,603	47,805
Long-term debt, less current maturities	340,835	340,664
Other long-term liabilities	6,934	7,359
Deferred income taxes	14,064	14,469
Total liabilities	408,436	410,297
Stockholders' equity (deficit)
Member's capital
Additional paid-in capital	935,446	930,814
Accumulated deficit	(921,305)	(925,421)
Total stockholders' equity (deficit)	14,150	5,401
Total liabilities and stockholders' equity (deficit)	422,586	415,698
Parent [Member] | Class A common stock [Member]
Stockholders' equity (deficit)
Common stock	6	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
Current maturities of long-term debt
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	35,788	32,214
Total liabilities	35,788	32,214
Stockholders' equity (deficit)
Member's capital	804,654	804,654
Additional paid-in capital
Accumulated deficit	(662,180)	(658,606)
Total stockholders' equity (deficit)	142,474	146,048
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	318	499	265	443
Trade receivables, net of allowance for doubtful accounts	280	251
Prepaid expenses and other current assets	619	467
Total current assets	1,217	1,217
Property and equipment, net	2,692	2,535
Intangible assets subject to amortization, net
Intangible assets not subject to amortization	3,700	3,700
Goodwill	994	994
Investment in subsidiaries
Other assets	10,496	10,603
Total assets	19,099	19,049
Current liabilities
Current maturities of long-term debt
Advances payable, related parties
Accounts payable and accrued expenses	678	742
Total current liabilities	678	742
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes
Total liabilities	678	742
Stockholders' equity (deficit)
Member's capital	12,652	12,652
Additional paid-in capital
Accumulated deficit	5,769	5,655
Total stockholders' equity (deficit)	18,421	18,307
Total liabilities and stockholders' equity (deficit)	19,099	19,049
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	(160,895)	(164,355)
Other assets	(10,496)	(10,603)
Total assets	(171,391)	(174,958)
Current liabilities
Current maturities of long-term debt
Advances payable, related parties
Accounts payable and accrued expenses	(9,139)	(9,121)
Total current liabilities	(9,139)	(9,121)
Long-term debt, less current maturities
Other long-term liabilities
Deferred income taxes	(1,357)	(1,482)
Total liabilities	(10,496)	(10,603)
Stockholders' equity (deficit)
Member's capital	(817,306)	(817,306)
Additional paid-in capital
Accumulated deficit	656,411	652,951
Total stockholders' equity (deficit)	(160,895)	(164,355)
Total liabilities and stockholders' equity (deficit)	(171,391)	(174,958)
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