Income per Share - Additional Information (Detail)	12 Months Ended
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Shares Excluded from Computation of Weighted average diluted Shares outstanding	4,344

Shares Excluded From Diluted Weighted Average Common Shares Outstanding Computation Due To Operating Losses

No definition available.

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Namespace Prefix:	atri_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration