CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenues		$ 138,914	$ 125,003	$ 279,884	$ 251,016
Cost of services (exclusive of depreciation and amortization of $648, $1,534, $1,305 and $3,064, respectively, included below)		99,071	88,879	201,470	180,258
Selling, general & administrative expenses		8,176	10,107	16,538	19,519
Depreciation and amortization		789	1,877	1,576	3,749
Restructuring and related charges		(52)	2	685	41
Operating income		30,930	24,138	59,615	47,449
Interest expense		4,130	4,176	7,964	8,281
Income before income taxes		26,800	19,962	51,651	39,168
Income tax expense		9,560	0	18,931	0
Net income from continuing operations		17,240	19,962	32,720	39,168
Loss from discontinued operations, net of income tax		(3,673)	(195,454)	(3,893)	(228,557)
Net income (loss)		13,567	(175,492)	28,827	(189,389)
Less: net income attributable to non-controlling interest		0	104	0	416
Net income (loss) attributable to Tivity Health, Inc.		$ 13,567	$ (175,596)	$ 28,827	$ (189,805)
Earnings (loss) per share attributable to Tivity Health, Inc. - basic:
Continuing operations (in dollars per share)		$ 0.44	$ 0.55	$ 0.84	$ 1.08
Discontinued operations (in dollars per share)		(0.09)	(5.41)	(0.10)	(6.34)
Net income (loss) (in dollars per share)	[1]	0.35	(4.85)	0.74	(5.25)
Earnings (loss) per share attributable to Tivity Health, Inc. - diluted:
Continuing operations (in dollars per share)		0.41	0.54	0.79	1.06
Discontinued operations (in dollars per share)		(0.09)	(5.25)	(0.09)	(6.18)
Net income (loss) (in dollars per share)	[1]	$ 0.32	$ (4.72)	$ 0.70	$ (5.12)
Comprehensive income (loss)		$ 17,957	$ (175,656)	$ 33,329	$ (188,507)
Weighted average common shares and equivalents:
Basic (in shares)		39,246	36,172	39,158	36,140
Diluted (in shares)		42,369	37,227	41,456	37,043

[1] Figures may not add due to rounding.