CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 500,998	$ 452,092	$ 405,263
Cost of services (exclusive of depreciation and amortization of $3,468, $5,440, and $4,974, respectively, included below)	357,120	318,060	272,400
Selling, general and administrative expenses	39,478	35,546	32,075
Depreciation and amortization	4,085	6,869	7,035
Restructuring and related charges	4,933	702	0
Legal settlement charges	0	0	5,910
Operating income	95,382	90,915	87,843
Interest expense	17,318	17,996	17,449
Income before income taxes	78,064	72,919	70,394
Income tax expense	21,973	29,285	27,558
Net income from continuing operations	56,091	43,634	42,836
Loss from discontinued operations, net of income tax benefit	(184,706)	(74,952)	(48,397)
Net loss	(128,615)	(31,318)	(5,561)
Less: net income (loss) attributable to non-controlling interest	496	(371)	0
Net loss attributable to Tivity Health, Inc.	$ (129,111)	$ (30,947)	$ (5,561)
Earnings (loss) per share attributable to Tivity Health, Inc. - basic:
Continuing operations (in dollars per share)	$ 1.52	$ 1.22	$ 1.21
Discontinued operations (in dollars per share)	(5.01)	(2.08)	(1.37)
Net loss (in dollars per share)	(3.49)	(0.86)	(0.16)
Earnings (loss) per share attributable to Tivity Health, Inc. - diluted:
Continuing operations (in dollars per share)	1.47	1.18	1.18
Discontinued operations (in dollars per share)	(4.86)	(2.02)	(1.33)
Net loss (in dollars per share)	$ (3.39)	$ (0.84)	$ (0.15)
Comprehensive loss	$ (128,878)	$ (33,509)	$ (7,202)
Weighted average common shares and equivalents:
Basic (in shares)	36,999	35,832	35,302
Diluted (in shares)	38,075	36,854	36,346