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Accumulated other comprehensive income (loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss)
AOCI consists of the following balances, net of tax:
 
Foreign currency cumulative translation
 
Unrealized gain on cash flow hedges
 
Pension and post-employment actuarial changes
 
Total
Balance, January 1, 2018
$
(47,701
)
 
$
55,366

 
$
(10,457
)
 
$
(2,792
)
Adoption of ASU 2018-02 on tax effects in AOCI
—

 
11,657

 
(1,032
)
 
10,625

Other comprehensive income (loss)
(27,969
)
 
1,567

 
2,046

 
(24,356
)
Amounts reclassified from AOCI to the consolidated statement of operations
—

 
(4,257
)
 
(86
)
 
(4,343
)
Net current period OCI
$
(27,969
)
 
$
(2,690
)
 
$
1,960

 
$
(28,699
)
OCI attributable to the non-controlling interests
1,481

 
—

 
—

 
1,481

Net current period OCI attributable to shareholders of APUC
$
(26,488
)
 
$
(2,690
)
 
$
1,960

 
$
(27,218
)
Balance, December 31, 2018
$
(74,189
)
 
$
64,333

 
$
(9,529
)
 
$
(19,385
)
Adoption of ASU 2017-12 on hedging (note 2(a))
—

 
186

 
—

 
186

Other comprehensive income (loss)
7,795

 
19,177

 
(7,999
)
 
18,973

Amounts reclassified from AOCI to the consolidated statement of operations
—

 
(8,597
)
—

1,490

 
(7,107
)
Net current period OCI
$
7,795

 
$
10,580

 
$
(6,509
)
 
$
11,866

OCI attributable to the non-controlling interests
(2,428
)
 
—

 
—

 
(2,428
)
Net current period OCI attributable to shareholders of APUC
$
5,367

 
$
10,580

 
$
(6,509
)
 
$
9,438

Balance, December 31, 2019
$
(68,822
)
 
$
75,099

 
$
(16,038
)
 
$
(9,761
)