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Earnings Per Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 30, 2014
Earnings Per Share [Line Items]
Common stock, shares outstanding	107,067,457us-gaap_CommonStockSharesOutstanding	107,067,457us-gaap_CommonStockSharesOutstanding		107,053,031us-gaap_CommonStockSharesOutstanding
Net income attributable to participating securities	$ 1dnow_NetIncomeAttributableToParticipatingSecurities	$ 0dnow_NetIncomeAttributableToParticipatingSecurities	$ 0dnow_NetIncomeAttributableToParticipatingSecurities
Restricted Stock Awards (RSAs) [Member]
Earnings Per Share [Line Items]
Antidilutive Securities excluded from Computation of Earnings Per Share	2,552,292us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AwardTypeAxis = dnow_RestrictedStockAwardsMember
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Antidilutive Securities excluded from Computation of Earnings Per Share	2,552,292us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Separation [Member]
Earnings Per Share [Line Items]
Common stock, shares outstanding	107,053,031us-gaap_CommonStockSharesOutstanding / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember			107,053,031us-gaap_CommonStockSharesOutstanding / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember
Spin-Off of shares	4dnow_ShareExchangeRatioInSpinOff / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember			4dnow_ShareExchangeRatioInSpinOff / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember

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Net Income Attributable To Participating Securities

+ References

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Share Exchange Ratio In Spin Off

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

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