Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	$ 118,352	$ 121,255
Current maturities of long-term debt	411,433	383,570
Equity — Noncontrolling interests	137,668	151,609
Arizona Public Service Company
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	118,352	121,255
Current maturities of long-term debt	411,433	383,570
Equity — Noncontrolling interests	137,668	151,609
Arizona Public Service Company | Consolidation of VIEs
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation	118,000	121,000
Current maturities of long-term debt	1,000	13,000
Equity — Noncontrolling interests	$ 138,000	$ 152,000