SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details)	3 Months Ended
	Mar. 31, 2017
Field equipment | Minimum
Depreciation and Amortization
Estimated useful lives of the assets	4 years
Field equipment | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	10 years
Office furniture, fixtures and equipment | Minimum
Depreciation and Amortization
Estimated useful lives of the assets	5 years
Office furniture, fixtures and equipment | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	7 years
Vehicles | Minimum
Depreciation and Amortization
Estimated useful lives of the assets	3 years
Vehicles | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	5 years
Leasehold improvements | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	3 years
Residential trailers | Minimum
Depreciation and Amortization
Estimated useful lives of the assets	10 years
Residential trailers | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	20 years
Buildings and improvements | Minimum
Depreciation and Amortization
Estimated useful lives of the assets	10 years
Buildings and improvements | Maximum
Depreciation and Amortization
Estimated useful lives of the assets	27 years 6 months