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Employee Bargaining Agreements and Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Employees	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Expenses for defined contribution plan	$ 13us-gaap_DefinedContributionPlanAdministrativeExpenses	$ 14us-gaap_DefinedContributionPlanAdministrativeExpenses	$ 6us-gaap_DefinedContributionPlanAdministrativeExpenses
Number of temporary employees	500dnow_NumberOfTemporaryEmployees
Projected benefit obligation	4us-gaap_DefinedBenefitPlanBenefitObligation
Defined benefit plan fair value of plan assets	$ 5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
UK [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plan	1dnow_NumberOfDefinedBenefitPensionPlans / us-gaap_StatementGeographicalAxis = country_GB
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total number of employee	5,000dnow_EntityNumberOfEmployee / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employees collective bargaining agreement	1.00%dnow_PercentageOfEmployeesCollectiveBargainingAgreement / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Entity Number Of Employee

+ References

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- Definition

Number Of Defined Benefit Pension Plans

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- Definition

Number Of Temporary Employees

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- Definition

Percentage Of Employees Collective Bargaining Agreement

+ References

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

Amount of administrative expenses incurred by a defined contribution plan.

+ References

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