Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Matrix	Apr. 16, 2012 Matrix	Mar. 31, 2012 Matrix	Mar. 31, 2011 Matrix	Mar. 31, 2013 Poseidon [Member]	May 01, 2012 Poseidon [Member]	Mar. 31, 2012 Poseidon [Member]	Mar. 31, 2011 Poseidon [Member]
Purchase price details
Cash paid	$ 5,073	$ 13,841	$ 0	$ 0	$ 2,033	$ 2,533	$ 0	$ 0
Purchase price holdback	853				500
Common Stock issued at fair value	3,953		0	0	0
Contingent consideration	2,862				0
Business Acquisition, Cost Of Acquired Entity, Non-compete Agreement	1,100				0
Total purchase price	$ 13,841				$ 2,533