Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income	$ 5,398	$ 6,070	$ 1,441	$ 10,349
Less: net income attributable to non-controlling interests	(2,899)	$ (6,070)	(970)	$ (10,349)
Net income attributable to PetIQ, Inc.	$ 2,499		$ 471
Denominator:
Weighted-average shares of Class A common stock outstanding - basic (in shares)	15,980,111		15,285,138
Dilutive effects of stock options that are convertible into Class A common stock	28,000		43,000
Weighted-average shares of Class A common stock outstanding - diluted (in shares)	16,008,046		15,328,596
Earnings per share of Class A common stock - basic ( in dollars per shares)	$ 0.16		$ 0.03
Earnings per share of Class A common stock - diluted ( in dollars per shares)	$ 0.16		$ 0.03
Stock options and restricted stock units
Denominator:
Anti dilutive shares excluded from computation of diluted earnings per share	1,039,004		1,039,004