From a more general/philosophical perspective, you can conceptualize your perimeter security plan in 5 topics:
1. Deter: The outermost perimeter. Visual deterrence such as fencing, lighting, and signs
2. Delay: Parking controls, and vehicle barriers
3. Detect: Perimeter Intrusion Detection systems and CCTV
4. Deny: Access control devices
7. Defend: The innermost ring. Actively repel/apprehend intruders.