FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense	$ 0	$ 6,305,000	$ 36,609,000
Net carrying value of property and equipment	470,910,000	263,862,000
Additions or disposals of goodwill	0	0	0
Goodwill impairment expense	0	1,177,000	0
Goodwill	9,425,000	9,425,000	10,602,000
Drilling
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense		6,300,000	28,600,000
Net carrying value of property and equipment		15,000,000	48,100,000
Acidizing unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense			8,000,000
Net carrying value of property and equipment			15,600,000
Surface drilling reporting unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		1,200,000
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense	0	6,305,000
Goodwill impairment expense	0	1,177,000
Nonrecurring basis | Balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implied fair value of goodwill	0	9,425,000
Nonrecurring basis | Surface drilling reporting unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment expense		1,200,000	0
Fair value of the reporting unit		3,800,000
Nonrecurring basis | Surface drilling reporting unit | Balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of reporting unit		4,200,000
Nonrecurring basis | Surface drilling reporting unit | Estimated fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implied fair value of goodwill		0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) interest rate swap	300,000	200,000	(300,000)
Interest rate swap | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of interest rate swap liability	$ 0	$ 300,000	$ 500,000