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Financial instruments - Derivative Financial Instruments Designated as Cash Flow Hedge, Effect on Statement of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value Disclosures [Abstract]        
Effective portion of cash flow hedge, gain (loss) $ 6,442 $ 6,204 $ 10,087 $ 3,764
Amortization of cash flow hedge (8) (8) (16) (16)
Amount reclassified from AOCI 5,733 (1,642) 3,559 (2,945)
OCI attributable to shareholders of APUC $ 12,167 $ 4,554 $ 13,630 $ 803