Intangible assets (Tables)

12 Months Ended

Dec. 31, 2019

Intangible assets

Schedule of Indefinite-Lived and Definite-Lived Intangible Assets

			Accumulated
As at December 31, 2019	Cost		amortization		Net book value
Trade names and trademarks	$	53,319	$	(2,028)	$	51,291
Customer relationships		124,865		(34,666)		90,199
Software		157,776		(78,330)		79,446
Software under development		12,444		—		12,444
	$	348,404	$	(115,024)	$	233,380

			Accumulated
As at December 31, 2018	Cost		amortization		Net book value
Trade names and trademarks	$	53,409	$	(1,201)	$	52,208
Customer relationships		124,986		(22,010)		102,976
Software		127,320		(48,522)		78,798
Software under development		11,640		—		11,640
	$	317,355	$	(71,733)	$	245,622

Schedule of Annual Amortization Expense

2020	$	35,539
2021		29,706
2022		23,438
2023		17,214
2024		10,139
	$	116,036