STATEMENTS OF CASH FLOWS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 GSTA	Feb. 27, 2012 Senior Secured Notes
STATEMENTS OF CASH FLOWS
Interest	$ 43,823,000	$ 44,519,000	$ 39,494,000
Income taxes	278,000	929,000	226,000
Debt
Fixed interest rate (as a percent)					11.50%
Principal amount of notes offered to be repurchased					7,400,000
Amount of premium included in loss on debt extinguishment					100,000
Unamortized original issue discount included in loss on debt extinguishment					100,000
Capitalized finance expense included in loss on debt extinguishment					200,000
Proceeds from sales of various publications		500,000
Amount of proceeds received at closing date		300,000
Deferred revenue included in sale		1,200,000
Debt instrument tendered and repurchased					7,400,000
Period over which monthly payment of agreed upon percentage of acquisition and renewal revenue is required to be paid				5 years
Useful life of intangible customer lists after purchase price allocation				5 years
Decrease in accrued liabilities and other long-term liabilities, resulting from adjustment to the fair value of the interest rate swap	3,900,000	3,900,000	300,000
Non-cash gain on derivative instruments	3,871,000	3,899,000	(6,680,000)
Prepaid and other assets related to the sold publications included in sales		1,000,000
Decrease in other comprehensive loss as the interest rate swaps no longer qualify as cash flow hedges			7,000,000
Amount of tax benefit receivable contributed by parent and recorded as additional paid in capital			$ 3,100,000