Idaho Code § 58-814

Whenever complaint shall be filed in any action as provided in this chapter, summons shall issue against the proper parties, and shall be served upon the proper person or persons named therein, as in other cases provided by law, or upon the agent or attorney of such person or persons who shall have filed the statements as required in section 58-804[, Idaho Code]; and in case service cannot be had upon the defendant, his agent or attorney, service may be made by publication thereof as provided by law.