Space detail is a shipboard operating condition that was used during the 2260s. Space detail was called just prior to a starship leaving orbit with a report made to the Commanding Officer once the space detail had been set.
In 2268, Montgomery Scott reported to Captain James T. Kirk that the space detail was set upon Kirk's order for the USS Enterprise to leave Eminiar VII. (TOS: "A Taste of Armageddon")
The setting of space detail is similar to the calling of departure stations, which is also set when a vessel leaves spacedock. (Star Trek VI: The Undiscovered Country)
Space detail appears to be similar to the United States Navy's condition of "Sea and Anchor Detail" which is called whenever a ship enters or leaves a port.