Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities [Abstract]
Net income	$ 28,486us-gaap_NetIncomeLoss	$ 37,884us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operations [Abstract]
Depreciation and amortization	20,111us-gaap_DepreciationAndAmortization	19,589us-gaap_DepreciationAndAmortization
Regulatory amortization of gas reserves	5,255nwn_Regulatoryamortizationofgasreserves	2,981nwn_Regulatoryamortizationofgasreserves
Deferred tax liabilities, net	5,918	205
Non-cash expenses related to qualified defined benefit pension plans	1,509us-gaap_PensionExpense	1,278us-gaap_PensionExpense
Contributions to qualified defined benefit pension plans	(2,630)us-gaap_PensionContributions	(2,800)us-gaap_PensionContributions
Deferred environmental recoveries, net of (expenditures)	(3,315)	83,252
Non-cash regulatory disallowance of prior environmental cost deferrals	15,000	0
non-cash interest income deferred environmental expenses	(5,322)	0
Other	900us-gaap_OtherNoncashIncome	603us-gaap_OtherNoncashIncome
Changes in assets and liabilities [Abstract]
Receivables	29,193	23,216
Inventories	8,543us-gaap_IncreaseDecreaseInInventories	27,200us-gaap_IncreaseDecreaseInInventories
Taxes accrued	6,724	26,824
Accounts payable	(26,550)	(1,671)
Interest accrued	4,348	4,041
Deferred gas costs	13,074	(14,049)
Other, net	17,005	11,579
Cash provided by operating activities	118,249	220,132
Investing activities [Abstract]
Capital expenditures	(27,135)	(25,588)
Utility gas reserves	(1,860)nwn_PaymentsToAcquireUtilityGasReserves	(19,681)nwn_PaymentsToAcquireUtilityGasReserves
Other	49	(191)
Cash used in investing activities	(28,946)	(45,460)
Financing activities [Abstract]
Common stock issued, net	700	1,400
Change in short-term debt	(78,500)	(155,600)
Cash dividend payments on common stock	(12,688)us-gaap_PaymentsOfDividendsCommonStock	(12,456)us-gaap_PaymentsOfDividendsCommonStock
Other	(3,131)	442
Cash used in financing activities	(93,619)	(166,214)
Increase (decrease) in cash and cash equivalents	(4,316)	8,458
Cash and cash equivalents, beginning of period	9,534	9,471
Cash and cash equivalents, end of period	5,218	17,929
Supplemental disclosure of cash flow information [Abstract]
Interest paid	5,399us-gaap_InterestPaid	7,502us-gaap_InterestPaid
Income taxes paid	$ 0us-gaap_IncomeTaxesPaid	$ 0us-gaap_IncomeTaxesPaid

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