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Non-cash operating items - Changes in Non-Cash Operating Items (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Changes In Non Cash Operating Items [Abstract]
Accounts receivable	$ 40,396	$ 45,821	$ 11,721	$ 29,784
Fuel and natural gas in storage	(9,420)	(6,885)	10,061	9,335
Supplies and consumable inventory	(2,944)	(3,397)	(4,921)	(5,344)
Income taxes recoverable	7,623	(2,066)	6,801	(2,074)
Prepaid expenses	1,138	7,287	(5,468)	4,034
Accounts payable	18,429	(10,457)	(10,108)	(50,512)
Accrued liabilities	(45,581)	(13,833)	(55,711)	(29,316)
Current income tax liability	(5,657)	2,099	694	2,789
Asset retirements and environmental obligations	(322)	(5,230)	(1,422)	(5,726)
Net regulatory assets and liabilities	2,007	9,638	8,124	7,039
Changes in non-cash operating items	$ 5,669	$ 22,977	$ (40,229)	$ (39,991)

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- Definition

Disclosure - Changes in Non-Cash Operating Items [Abstract]

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No definition available.

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Increase (Decrease) In Asset Retirement And Environmental Obligations

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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-Section 45
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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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The increase (decrease) during the reporting period in the value of fuel held in inventory.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The increase (decrease) during the period in the carrying amount of capitalized costs of materials, supplies, or both, which are not included in inventory.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

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