Change in Unfavorable Drilling Contracts from the Merger (Detail) - Unfavorable Drilling Contracts - USD ($) $ in Thousands	2 Months Ended
Jun. 30, 2017	Apr. 20, 2017
Business Acquisition Contingent Consideration [Line Items]
Liabilities at fair value (See Note 2)		$ 2,532
Amortization	$ (1,586)
Unfavorable drilling contracts liability at end of period	$ 946

Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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