Identified Intangible Assets and Goodwill, Net Schedule of Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, balance at January 1, 2012	$ 21,677
Goodwill, acquisitions	1,820
Goodwill, translation and other adjustments	18
Goodwill, balance at December 31, 2012	23,515
Utility Services [Member]
Goodwill [Roll Forward]
Goodwill, balance at January 1, 2012	1,314
Goodwill, acquisitions	0
Goodwill, translation and other adjustments	0
Goodwill, balance at December 31, 2012	1,314
Residential Commercial Services [Member]
Goodwill [Roll Forward]
Goodwill, balance at January 1, 2012	18,616
Goodwill, acquisitions	1,812
Goodwill, translation and other adjustments	18
Goodwill, balance at December 31, 2012	20,446
All Other Segments [Member]
Goodwill [Roll Forward]
Goodwill, balance at January 1, 2012	1,747
Goodwill, acquisitions	8
Goodwill, translation and other adjustments	0
Goodwill, balance at December 31, 2012	$ 1,755