Identified Intangible Assets and Goodwill, Net Schedule of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
Jul. 01, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 33,831	$ 30,305
Goodwill, acquisitions	3,504
Goodwill, translation and other adjustments	22
Utility services [Member]
Goodwill [Line Items]
Goodwill	3,424	3,424
Goodwill, acquisitions	0
Goodwill, translation and other adjustments	0
Residential commercial services [Member]
Goodwill [Line Items]
Goodwill	30,407	$ 26,881
Goodwill, acquisitions	3,504
Goodwill, translation and other adjustments	$ 22

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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