Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities: [Abstract]
Net income	$ 58,692us-gaap_NetIncomeLoss	$ 60,538us-gaap_NetIncomeLoss	$ 58,779us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax	54,974	63,471	57,288
Adjustments to reconcile net income to cash provided by operations: [Abstract]
Depreciation and amortization	79,193us-gaap_DepreciationAndAmortization	75,905us-gaap_DepreciationAndAmortization	73,017us-gaap_DepreciationAndAmortization
Regulatory amortization of gas reserves	19,335nwn_Regulatoryamortizationofgasreserves	11,089nwn_Regulatoryamortizationofgasreserves	6,340nwn_Regulatoryamortizationofgasreserves
Deferred tax liabilities, net	24,772	46,483	42,079
Non-cash expenses related to qualified defined benefit pension plans	4,984us-gaap_PensionExpense	5,666us-gaap_PensionExpense	5,448us-gaap_PensionExpense
Contributions to qualified defined benefit pension plans	(10,500)us-gaap_PensionContributions	(11,700)us-gaap_PensionContributions	(23,500)us-gaap_PensionContributions
Deferred environmental expenditures, net of recoveries	88,849	(16,679)	(12,503)
Other	1,853us-gaap_OtherNoncashIncome	(2,580)us-gaap_OtherNoncashIncome	(2,350)us-gaap_OtherNoncashIncome
Changes in assets and liabilities: [Abstract]
Receivables	14,948	(26,094)	22,170
Inventories	(17,163)us-gaap_IncreaseDecreaseInInventories	6,933us-gaap_IncreaseDecreaseInInventories	6,761us-gaap_IncreaseDecreaseInInventories
Taxes accrued	1,709	286	3,334
Accounts payable	(2,020)	7,422	(602)
Interest accrued	(1,024)	1,150	96
Deferred gas costs	(23,114)	(5,245)	(17,644)
Other, net	(24,857)	23,216	7,413
Cash provided by operating activities	215,657	176,390	168,838
Investing activities: [Abstract]
Capital expenditures	(120,092)	(138,924)	(132,029)
Utility gas reserves	(26,798)nwn_PaymentsToAcquireUtilityGasReserves	(54,077)nwn_PaymentsToAcquireUtilityGasReserves	(54,085)nwn_PaymentsToAcquireUtilityGasReserves
Proceeds from sale of assets	175	8,638	0
Restricted cash	1,000	0	0
Other	1,392	2,231	1,437
Cash used in investing activities	(144,323)	(182,132)	(184,677)
Financing activities: [Abstract]
Common stock issued, net	8,986nwn_CommonStockIssuedNet	5,964nwn_CommonStockIssuedNet	6,758nwn_CommonStockIssuedNet
Long-term debt issued	0	50,000	50,000
Long-term debt retired	(80,000)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt	(40,000)us-gaap_RepaymentsOfLongTermDebt
Change in short-term debt	46,500	(2,050)	48,650
Cash dividend payments on common stock	(50,093)us-gaap_PaymentsOfDividendsCommonStock	(49,204)us-gaap_PaymentsOfDividendsCommonStock	(48,007)us-gaap_PaymentsOfDividendsCommonStock
Other	3,336	1,580	1,528
Cash provided by (used in) financing activities	(71,271)	6,290	18,929
Increase in cash and cash equivalents	63	548	3,090
Cash and cash equivalents, beginning of period	9,471	8,923	5,833
Cash and cash equivalents, end of period	9,534	9,471	8,923
Supplemental disclosure of cash flow information: [Abstract]
Interest paid	42,602us-gaap_InterestPaid	44,022us-gaap_InterestPaid	43,061us-gaap_InterestPaid
Income taxes paid	$ 19,445us-gaap_IncomeTaxesPaid	$ 870us-gaap_IncomeTaxesPaid	$ 2,979us-gaap_IncomeTaxesPaid

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

+ References

+ Details

Name:	us-gaap_PensionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration