Held for Sale Assets - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
Jul. 24, 2018	Sep. 30, 2018	Sep. 30, 2018
Assets Held For Sale Not Part Of Disposal Group [Abstract]
Asset impairment charge and loss on divestiture, net	$ 98,278	$ 98,278	$ 98,278
Non-cash loss, net of estimated proceeds	$ 106,195
Decrease in depreciation expense per quarter		$ 900

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration