SEGMENT INFORMATION: (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Total revenues	$ 224,655	$ 221,193	$ 207,345	$ 196,895	$ 205,734	$ 208,246	$ 204,248	$ 186,683	$ 850,088	$ 804,911	$ 805,153
Gross profit:
Total gross profit	101,029	95,458	86,033	79,186	78,026	82,439	79,290	71,119	361,706	310,874	299,636
Income (loss) from operations:
Income (loss) from operations	$ (7,764)	$ (374)	$ (2,056)	$ (2,869)	$ (10,865)	$ (2,290)	$ (6,443)	$ (13,086)	(13,063)	(32,684)	1,557
Gains, losses and other items, net									12,132	22,600	17,168
Impairment of goodwill and other assets									6,829		24,953
Depreciation and amortization:
Depreciation and amortization									85,463	80,447	56,900
Marketing Services
Depreciation and amortization:
Depreciation and amortization									9,988	12,280	7,763
Audience Solutions
Depreciation and amortization:
Depreciation and amortization									12,909	12,652	14,991
Connectivity
Depreciation and amortization:
Depreciation and amortization									19,932	16,469	3,061
Operating segment
Revenues:
Total revenues									850,088	804,911	805,153
Gross profit:
Total gross profit									381,172	328,103	301,214
Income (loss) from operations:
Income (loss) from operations									180,671	156,256	156,954
Operating segment | Marketing Services
Revenues:
Total revenues									449,772	446,103	465,572
Gross profit:
Total gross profit									152,258	156,395	150,533
Income (loss) from operations:
Income (loss) from operations									74,371	81,247	83,771
Operating segment | Audience Solutions
Revenues:
Total revenues									297,846	303,836	325,932
Gross profit:
Total gross profit									167,715	158,386	162,369
Income (loss) from operations:
Income (loss) from operations									109,598	115,078	119,950
Operating segment | Connectivity
Revenues:
Total revenues									102,470	54,972	13,649
Gross profit:
Total gross profit									61,199	13,322	(11,688)
Income (loss) from operations:
Income (loss) from operations									(3,298)	(40,069)	(46,767)
Corporate
Depreciation and amortization:
Depreciation and amortization									42,634	39,046	31,085
Reconciling items
Gross profit:
Purchased intangible asset amortization									15,466	11,454
Non-cash stock compensation									2,150	1,459	1,578
Corporate expenses									1,850	4,316
Income (loss) from operations:
Corporate expenses									127,844	126,570	99,818
Gains, losses and other items, net									12,132	22,600	17,168
Purchased intangible asset amortization									15,466	11,454	252
Non-cash stock compensation									$ 31,463	$ 28,316	$ 13,206