Goodwill and Intangible Assets - Changes in Goodwill by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Professional Services	Jun. 30, 2014 Infrastructure Services	Dec. 31, 2013 Infrastructure Services	Jun. 30, 2014 Field Services	Jun. 30, 2014 Other Services
Intangible Assets [Line Items]
Goodwill at December 31, 2013	$ 69,134	$ 8,604	$ 1,882	$ 1,882	$ 58,463	$ 185
Integration of the Other Services segment					185	(185)
Purchase price allocation adjustment	44	44
Goodwill at June 30, 2014	$ 69,178	$ 8,648	$ 1,882	$ 1,882	$ 58,648