Concentration Risk

6 Months Ended

Jun. 30, 2011

Concentration Risk [Abstract]

Concentration Risk

14. Concentration Risk

     Arbitron is a leading media and marketing information services firm primarily serving radio, advertising agencies, cable and broadcast television, advertisers, retailers, out-of-home media, online media and print media.

     The Company’s quantitative radio audience ratings service and related software licensing revenue accounted for the following percentages, in the aggregate, of total Company revenue:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Quantitative radio audience ratings service and related software licensing revenue		81	%		81	%		89	%		89	%

     The Company had one customer that individually represented 20% of its annual revenue for the year ended December 31, 2010. The Company had two customers that individually represented 17% and 12% of its total accounts receivable as of June 30, 2011, and two customers that individually represented 24% and 11% of its total accounts receivable as of December 31, 2010. The Company has historically experienced a high level of contract renewals.