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Heterogeneous computing systems, e.g., those with accelerators than the host CPUs, offer the accelerated performance for a variety of workloads. However, most parallel programming models require platform dependent, time-consuming hand-tuning efforts for collectively using all the resources in a system to achieve efficient results. In this work, we explore the use of OpenMP parallel language extensions to empower users with the ability to design applications that automatically and simultaneously leverage CPUs and accelerators to further optimize use of available resources. We believe such automation will be key to ensuring codes adapt to increases in the number and diversity of accelerator resources for future computing systems. The proposed system combines language extensions to OpenMP, load-balancing algorithms and heuristics, and a runtime system for loop distribution across heterogeneous processing elements. We demonstrate the effectiveness of our automated approach to program on systems with multiple CPUs, GPUs, and MICs.