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Property and Equipment - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2015 $ / bbl	Sep. 30, 2015 USD ($) $ / bbl	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Rigs	Dec. 31, 2015 USD ($) Rigs
Property Plant And Equipment [Line Items]
Impairment charge for the write-down of drilling equipment | $			$ 29,000,000	$ 0	$ 131,000,000
Expected cash flows from contract drilling segment | $		$ 801,000,000			$ 710,000,000
Average oil price per barrel | $ / bbl	38.22	46.42
Drilling Rigs That Would No Longer Be Marketed As Rigs
Property Plant And Equipment [Line Items]
Number of drilling rigs					33
Mechanically Powered Drilling Rigs That Would No Longer Be Marketed as Rigs
Property Plant And Equipment [Line Items]
Number of drilling rigs					24
Non-APEX® electric Drilling Rigs That Would No Longer Be Marketed as Rigs
Property Plant And Equipment [Line Items]
Number of drilling rigs					9
Mechanically powered drilling rigs that remain marketed but are not operating
Property Plant And Equipment [Line Items]
Number of drilling rigs				19	15
Pressure Pumping
Property Plant And Equipment [Line Items]
Impairment charge for the write-down of drilling equipment | $			$ 0	$ 0	$ 22,000,000
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of long-lived assets		60.00%			100.00%
Contract Drilling
Property Plant And Equipment [Line Items]
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of long-lived assets		120.00%			120.00%

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

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