Debtor's Condensed Combined Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net loss		$ (524,410)	$ (88,643)
Reorganization items		308,011
Provision for deferred income taxes		(5,543)
Depreciation		36,287	44,552
Compensation expense - stock-based		326	1,536
Gain on asset dispositions, net		(3,189)	(5,643)
Asset impairments	[1]	163,423	36,886
Net cash used in operating activities		(23,363)	(10,903)
Investing activities:
Proceeds from sales of assets		608	1,234
Additions to properties and equipment		(1,627)	(7,578)
Net cash provided by investing activities		4,253	5,171
Financing activities:
Net cash used in financing activities		(3,516)	(4,046)
Net change in cash and cash equivalents		(22,626)	(9,778)
Cash and cash equivalents at beginning of period		706,404	678,438
Cash and cash equivalents at end of period		683,778	$ 668,660
Debtor's
Operating activities:
Net loss		(394,596)
Reorganization items		308,011
Provision for deferred income taxes		(5,543)
Depreciation		10,798
Compensation expense - stock-based		291
Gain on asset dispositions, net		(3,011)
Asset impairments		65,715
Changes in assets and liabilities, net		13,261
Net cash used in operating activities		(5,074)
Investing activities:
Proceeds from sales of assets		129
Additions to properties and equipment		(585)
Net cash provided by investing activities		(456)
Financing activities:
Dividend received from non-debtor entity		4,800
Net cash used in financing activities		4,800
Net change in cash and cash equivalents		(730)
Cash and cash equivalents at beginning of period		805
Cash and cash equivalents at end of period		$ 75

[1] Refer to Note (16) for additional information regarding asset impairment charges.