Detention is a fee charged to shippers, consignees, or logistics providers when shipping containers, trailers, or other carrier-owned equipment are held beyond the allotted free time after being picked up from a port, terminal, or warehouse. This time-based penalty begins accruing once the equipment leaves the terminal or facility and continues until the empty container or equipment is returned to the designated location. Detention charges serve as a financial incentive to ensure the efficient circulation of equipment within the supply chain, preventing bottlenecks that can disrupt carrier operations and reduce asset availability for other shipments.