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Financial instruments - Derivative Financial Instruments Designated as Cash Flow Hedge, Effect on Statement of Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Effective portion of cash flow hedge, gain (loss) $ 1,567 $ 8,004
Amortization of cash flow hedge (33) (27)
Amounts reclassified from AOCI (4,224) (6,351)
Change in fair value of cash flow hedges, net of tax recovery of $952 and expense of $599, respectively (note 23(b)(ii)) $ (2,690) $ 1,626