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Property, plant and equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, plant and equipment Property, plant and equipment
December 31, 2023CostAccumulated
Depreciation		Net Book Value
Owned assets
Heavy equipment$503,359 $133,448 $369,911 
Major component parts in use747,036 207,969 539,067 
Other equipment49,207 33,952 15,255 
Licensed motor vehicles20,051 7,207 12,844 
Office and computer equipment10,133 6,336 3,797 
Buildings45,681 5,231 40,450 
Capital inventory and capital work in progress 84,555 — 84,555 
Land10,472 — 10,472 
1,470,494 394,143 1,076,351 
Assets under finance lease
Heavy equipment64,691 19,435 45,256 
Major component parts in use28,514 9,580 18,934 
Other equipment37 12 25 
Licensed motor vehicles2,555 175 2,380 
95,797 29,202 66,595 
Total property, plant and equipment$1,566,291 $423,345 $1,142,946 
December 31, 2022CostAccumulated
Depreciation		Net Book Value
Owned assets
Heavy equipment$368,318 $123,695 $244,623 
Major component parts in use388,169 163,124 225,045 
Other equipment40,752 30,769 9,983 
Licensed motor vehicles12,109 6,800 5,309 
Office and computer equipment7,510 5,669 1,841 
Buildings29,725 4,489 25,236 
Capital inventory and capital work in progress46,050 — 46,050 
Land10,472 — 10,472 
903,105 334,546 568,559 
Assets under finance lease
Heavy equipment75,750 28,265 47,485 
Major component parts in use40,406 22,264 18,142 
Other equipment4,238 1,814 2,424 
Licensed motor vehicles9,669 469 9,200 
130,063 52,812 77,251 
Total property, plant and equipment$1,033,168 $387,358 $645,810