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TRANSACTIONS WITH RELATED PARTIES (Schedule of Transactions with Related Parties) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) ITEM	Dec. 31, 2016 USD ($) ITEM	Dec. 31, 2015 USD ($) ITEM
Senior Management [Member]
Related Party Transaction [Line Items]
Compensation and benefits, including benefit component of option grants | $	$ 1,615	$ 1,464	$ 1,236
Number of individuals to which this benefit related | ITEM	5	5	5
Chairman of the Board [Member]
Related Party Transaction [Line Items]
Compensation and benefits, including benefit component of option grants | $	$ 167	$ 167	$ 173
Number of individuals to which this benefit related | ITEM	1	1	1
Directors [Member]
Related Party Transaction [Line Items]
Compensation and benefits, including benefit component of option grants | $	$ 150	$ 161	$ 161
Number of individuals to which this benefit related | ITEM	5	6	5

X

- Definition

Represents information pertaining to number of individuals to which this benefit related during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	tatt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost (reversal of cost) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BoardOfDirectorsChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: