Income Taxes - Tax Effects of Temporary Differences (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Non-current deferred tax liabilities adjustments	$ 4,469	$ (1,444)

Amount of fresh-start adjustment to noncurrent deferred income tax liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 740
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6918596&loc=d3e57478-112775

Name:	us-gaap_FreshStartAdjustmentIncreaseDecreaseDeferredIncomeTaxLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant