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Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Debt Instrument [Line Items] |
Term of loan | 5 years
Agreement date | Apr. 18, 2014
Aggregate loan amount | $ 750
Sub-facility for letter of credit | 150
Sub-facility for swing line loans | 50
Increase in aggregate principal amount | $ 250
Maximum capitalization ratio | 50.00%
Minimum interest coverage ratio | 3.00%
Federal Funds Rate [Member] |
Debt Instrument [Line Items] |
Base rate | 0.50%
London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument [Line Items] |
Base rate | 1.00%

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- Definition Line Of Credit Facility Covenant Terms Minimum Interest Coverage Ratio + References No definition available. + Details
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Namespace Prefix: | dnow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum Debt To Capitalization Ratio Allowable + References No definition available. + Details
Name: | dnow_MaximumDebtToCapitalizationRatioAllowable
Namespace Prefix: | dnow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Sub Facility For Letters Of Credit + References No definition available. + Details
Name: | dnow_SubFacilityForLettersOfCredit
Namespace Prefix: | dnow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sub Facility For Swing Line Loans + References No definition available. + Details
Name: | dnow_SubFacilityForSwingLineLoans
Namespace Prefix: | dnow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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