ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Accumulated Other Comprehensive Income Loss (Detail) - Predecessor - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, net of tax	$ 7.4	$ 24.0
Other comprehensive income (loss) before reclassifications:
Change in fair value of derivatives	2.3	(1.7)
Income tax effect	(0.8)	0.6
Net of tax	1.5	(1.1)
Amounts reclassified from accumulated other comprehensive income
Income tax effect	(2.7)	(10.4)
Net of tax	5.0	19.0
Other comprehensive loss, net of tax	(3.5)	(20.1)
Ending balance, net of tax	3.9	3.9
Cash Flow Hedges | Operating revenue: oil/natural gas production
Amounts reclassified from accumulated other comprehensive income
Operating revenue: oil/natural gas production	7.7	29.4
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		(1.7)
Income tax effect		0.6
Net of tax		(1.1)
Amounts reclassified from accumulated other comprehensive income
Income tax effect		(10.4)
Net of tax		13.0
Other comprehensive loss, net of tax		(14.1)
Ending balance, net of tax	$ 3.9	3.9
Accumulated Other Comprehensive Income (Loss) | Operating revenue: oil/natural gas production
Amounts reclassified from accumulated other comprehensive income
Operating revenue: oil/natural gas production		29.4
Accumulated Other Comprehensive Income (Loss) | Other operational expenses
Amounts reclassified from accumulated other comprehensive income
Operating revenue: oil/natural gas production		$ (6.0)