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Is there a short term for lack of a date of expiry when talking about documents? I'm specifically interested in identification document (ID).

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Are you referring to permanent, non-expiring documents, or instead to incomplete / uncompleted forms? – jwpat7 Apr 24 '12 at 7:52
I'm referring to permanent, non-expiring documents. – Piotr Dobrogost Apr 24 '12 at 9:03
For foods, the term is "stable'. But I don't think that works with documents unless you get people to agree to your use. – David Schwartz Apr 24 '12 at 12:28
up vote 5 down vote accepted

I would simply use the term non-expiring. For example, in Washington state, one can obtain a non-expiring license for child care.

You may also encounter the phrase valid in perpetuity, e.g. Hawaii Rev. Stat. §481B-13 (about electronic gift cards/certificates):

…if the gift certificate does not have an expiration date, it shall be valid in perpetuity.

This phrase is generally used in describing the length of effect of a legal document (like a contract or a constitution) or financial instrument rather than an identification, though, so I would consider it a secondary choice.

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You could say the identification document has lifelong validity.

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