ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Accumulated Other Comprehensive Income Loss (Detail) - Predecessor - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, net of tax	$ 18.7	$ 24.0
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives	(8.6)	(4.0)
Income tax effect	3.1	1.4
Net of tax	(5.5)	(2.6)
Amounts reclassified from accumulated other comprehensive income:
Income tax effect	(3.1)	(7.7)
Net of tax	5.8	14.0
Other comprehensive loss, net of tax	(11.3)	(16.6)
Ending balance, net of tax	7.4	7.4
Cash Flow Hedges | Operating revenue: oil/natural gas production
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production	8.9	21.7
Cash Flow Hedges | Other operational expenses
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production		0.0
Foreign Currency Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, net of tax		(6.0)
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		0.0
Income tax effect		0.0
Net of tax		0.0
Amounts reclassified from accumulated other comprehensive income:
Income tax effect		0.0
Net of tax		(6.0)
Other comprehensive loss, net of tax		6.0
Ending balance, net of tax	0.0	0.0
Foreign Currency Items | Operating revenue: oil/natural gas production
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production		0.0
Foreign Currency Items | Other operational expenses
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production		(6.0)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, net of tax		18.0
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives		(4.0)
Income tax effect		1.4
Net of tax		(2.6)
Amounts reclassified from accumulated other comprehensive income:
Income tax effect		(7.7)
Net of tax		8.0
Other comprehensive loss, net of tax		(10.6)
Ending balance, net of tax	$ 7.4	7.4
Accumulated Other Comprehensive Income (Loss) | Operating revenue: oil/natural gas production
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production		21.7
Accumulated Other Comprehensive Income (Loss) | Other operational expenses
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/natural gas production		$ (6.0)