XML 60 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1

Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Depreciation is calculated based on the cost, net of the estimated residual value, over the estimated useful life of the assets on the following bases and rates:

Assets		Basis		Rate
Heavy equipment		Units of production		5,000 - 70,000 hours
Major component parts in use		Units of production		1,000 - 36,000 hours
Other equipment		Straight-line		5 – 10 years
Licensed motor vehicles		Straight-line		5 – 10 years
Office and computer equipment		Straight-line		4 years
Buildings		Straight-line		10 – 25 years
Leasehold improvements		Straight-line		Over shorter of estimated useful life and lease term

December 31, 2017		Cost				Accumulated Depreciation				Net Book Value
Owned assets
Heavy equipment		$	196,045			$	77,726			$	118,319
Major component parts in use		72,448				45,694				26,754
Other equipment		31,923				18,400				13,523
Licensed motor vehicles		18,298				14,888				3,410
Office and computer equipment		10,157				9,468				689
Land		7,168				—				7,168
Buildings		2,547				2,482				65
		338,586				168,658				169,928
Assets under capital lease
Heavy equipment		69,657				28,613				41,044
Major component parts in use		85,015				21,247				63,768
Other equipment		558				543				15
Licensed motor vehicles		5,129				1,242				3,887
Office and computer equipment		23				17				6
		160,382				51,662				108,720
Total property, plant and equipment		$	498,968			$	220,320			$	278,648

December 31, 2016		Cost				Accumulated Depreciation				Net Book Value
Owned assets
Heavy equipment		$	188,785			$	68,487			$	120,298
Major component parts in use		64,229				49,673				14,556
Other equipment		31,670				16,335				15,335
Licensed motor vehicles		20,353				18,258				2,095
Office and computer equipment		9,769				9,112				657
Buildings		2,523				2,487				36
		317,329				164,352				152,977
Assets under capital lease
Heavy equipment		84,527				21,848				62,679
Major component parts in use		50,882				17,233				33,649
Other equipment		5,178				611				4,567
Licensed motor vehicles		3,373				805				2,568
Office and computer equipment		23				11				12
		143,983				40,508				103,475
Total property, plant and equipment		$	461,312			$	204,860			$	256,452

X

- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration