Business Combinations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												0 Months Ended		0 Months Ended		0 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended		3 Months Ended			3 Months Ended					0 Months Ended			1 Months Ended	3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Non-compete agreements Minimum	Mar. 31, 2013 Non-compete agreements Maximum	Mar. 31, 2013 Customer relationship Minimum	Mar. 31, 2013 Customer relationship Maximum	Mar. 31, 2013 Tradename Minimum	Mar. 31, 2013 Tradename Maximum	Mar. 31, 2013 FSSI	Jun. 30, 2013 FSSI	Mar. 11, 2013 FSSI	Mar. 11, 2013 FSSI 2013 earnout target	Mar. 11, 2013 FSSI 2013 earnout target Minimum	Mar. 11, 2013 FSSI 2014 earnout target	Mar. 11, 2013 FSSI 2014 earnout target Minimum	Mar. 11, 2013 FSSI 2015 earnout target	Mar. 11, 2013 FSSI 2015 earnout target Minimum	Mar. 11, 2013 FSSI Non-compete agreement with a key employee	Mar. 11, 2013 FSSI Customer relationship	Mar. 11, 2013 FSSI Non-competition and non-solicitation agreement with a key employee	Mar. 31, 2013 FSSI Non-competition and non-solicitation agreement with a key employee	Mar. 11, 2013 FSSI Tradename	Mar. 12, 2012 Sprint	Mar. 31, 2013 Sprint	Mar. 31, 2013 Sprint 2012 earnout target	Dec. 31, 2012 Sprint 2012 earnout target	Mar. 31, 2013 Sprint 2012 earnout target Minimum	Mar. 31, 2013 Sprint 2013 earnout target	Dec. 31, 2012 Sprint 2013 earnout target	Mar. 12, 2012 Sprint 2013 earnout target	May 30, 2012 Silva	Sep. 28, 2012 Saxon item	Mar. 31, 2013 Saxon	Dec. 31, 2012 Saxon	Jan. 31, 2013 Q3 Contracting	Mar. 31, 2013 Q3 Contracting	Dec. 31, 2012 Q3 Contracting	Nov. 17, 2012 Q3 Contracting	Mar. 31, 2013 Q3 Contracting Earnout target period from November 18, 2012 through December 31, 2013	Mar. 31, 2013 Q3 Contracting Earnout target period from November 18, 2012 through December 31, 2013 Minimum	Mar. 31, 2013 Q3 Contracting 2014 earnout target	Mar. 31, 2013 Q3 Contracting 2014 earnout target Minimum
Business combinations
Cash consideration											$ 1,025																					$ 550						$ 48,116
Additional cash payment due sellers	(650)	(2,116)								650
Cash payable																		1,000		1,000
Period of a non-compete agreement to a key employee																		5 years
Potential contingent consideration												500		500		500									4,000			4,000				2,500							3,750		3,750
Pretax income threshold for measuring financial performance													553		2,502		4,227										7,000	7,750				4,000								17,700		19,000
Contingent consideration									838		838														4,000	4,000		3,109	3,020	2,745		1,950	2,106	2,028		7,672	7,490
Period of employment, non-competition and non-solicitation agreement with a key employee																				5 years
Amortization period of agreement			2 years	5 years	5 years	15 years	3 years	10 years													5 years
Revenues	409,995	291,573							483
Gross Profit	46,096	37,596							128
Small tools inventory received in acquisition											302
Property, plant and equipment received in acquisition											448
Accounts payable received in acquisition											1,060
Intangible assets																		1,000	500			300
Estimated useful life of intangible assets																						5 years
Goodwill											2,023
Total consideration											2,513												28,377								14,090	4,929						55,994
Company common stock as a part of consideration																							980															430
Number of shares of common stock issued																							62,052	62,052											29,273	29,273
Earnout consideration																							6,200															7,448
Promissory note as part of consideration																																2,429
Number of targets for payment of contingent cash consideration																																2
EBITDA threshold for measuring financial performance, case two																																4,750
Additional potential contingent consideration																																							$ 1,250		$ 1,250