Components of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal income tax benefit:
Current	$ (3,954)	$ (42)	$ (24,777)
Deferred	(35,081)	(335,106)	(134,592)
Federal income tax benefit, Total	(39,035)	(335,148)	(159,369)
State income tax expense (benefit):
Current	1,704	(215)	(257)
Deferred	(11,147)	4,511	(14,163)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	(9,443)	4,296	(14,420)
Foreign income tax expense (benefit):
Current	(2,552)	(3,108)	(368)
Deferred	5,043	249	(3,405)
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	2,491	(2,859)	(3,773)
Total income tax benefit:
Current	(4,802)	(3,365)	(25,402)
Deferred	(41,185)	(330,346)	(152,160)
Total income tax benefit:	$ (45,987)	$ (333,711)	$ (177,562)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319