Earnings (Loss) per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings (Loss) Per Share

The following table sets forth the computation of basic and diluted earnings (loss) per share (in thousands, except per share amounts):

	Year Ended December 31,
	2017			2016		2015
Numerators:
Income from continuing operations	$	62,307		$	22,003	$	35,628
Less: Net income attributable to noncontrolling interest		(2,256	)		—		—
Income from continuing operations attributable to Novanta Inc.		60,051			22,003		35,628
Less: Adjustment of redeemable noncontrolling interest to estimated redemption value (see Note 17)		(20,244	)		—		—
Income from continuing operations attributable to Novanta Inc. after adjustment of redeemable noncontrolling interest to estimated redemption value		39,807			22,003		35,628
Loss from discontinued operations		—			—		(13	)
Net income attributable to Novanta Inc. after adjustment of redeemable noncontrolling interest to estimated redemption value	$	39,807		$	22,003	$	35,615
Denominators:
Weighted average common shares outstanding— basic		34,817			34,694		34,579
Dilutive potential common shares		463			220		248
Weighted average common shares outstanding— diluted		35,280			34,914		34,827
Antidilutive common shares excluded from above		—			85		—
Basic Earnings (Loss) per Common Share:
From continuing operations	$	1.14		$	0.63	$	1.03
From discontinued operations	$	—		$	—	$	(0.00	)
Basic earnings (loss) per share attributable to Novanta Inc.	$	1.14		$	0.63	$	1.03
Diluted Earnings (Loss) per Common Share:
From continuing operations	$	1.13		$	0.63	$	1.02
From discontinued operations	$	—		$	—	$	(0.00	)
Diluted earnings (loss) per share attributable to Novanta Inc.	$	1.13		$	0.63	$	1.02