Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Palo Verde Sale Leaseback Variable Interest Entities
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	$ 14,637,407	$ 14,522,538
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Equity — Noncontrolling interests	127,414	122,540
APS
Palo Verde Sale Leaseback Variable Interest Entities
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	14,637,029	14,522,156
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Equity — Noncontrolling interests	127,414	122,540
Palo Verde VIE
Palo Verde Sale Leaseback Variable Interest Entities
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	100,938	101,906
Palo Verde VIE | APS
Palo Verde Sale Leaseback Variable Interest Entities
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	100,938	101,906
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Equity — Noncontrolling interests	$ 127,414	$ 122,540