Preferred Members' Interest - Additional Information (Detail) - Mediacom LLC [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jul. 31, 2001
Class Of Stock [Line Items]
Preferred equity investment					$ 150.0
Percentage of annual cash dividend on preferred equity investment			12.00%
Cash dividends on PMI	$ 4.5	$ 4.5	$ 13.5	$ 13.5