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Acquisitions (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Dec. 21, 2013
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Jun. 30, 2013
Dec. 21, 2013
Kvaerner NAC
Mar. 31, 2014
Kvaerner NAC
Mar. 31, 2014
Matrix NAC
Mar. 31, 2014
Matrix NAC
Dec. 31, 2012
Pelichem
Business Acquisition [Line Items]                      
Business Acquisition, Effective Date of Acquisition             Dec. 21, 2013       Dec. 31, 2012
Business Acquisition, Percentage of Voting Interests Acquired             100.00%        
Business Acquisition, Name of Acquired Entity Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc                    
Business Combination, Consideration Transferred             $ 88,100,000        
Goodwill   66,589,000   66,589,000   30,836,000 36,176,000       2,247,000
Tax deductible goodwill             28,500,000        
Noncontrolling Interest, Description               The Joint Venture was formed by Kvaerner North American Construction Inc. and an engineering firm to engineer and construct a combined cycle power plant in Dover, Delaware.      
Noncontrolling Interest, Ownership Percentage by Parent               65.00%      
mtrx_JointVentureValue               2,000,000      
mtrx_ControllingInterestOfJointVenture,Value               1,300,000      
Noncontrolling interest of consolidated joint venture             700,000 1,100,000      
Revenues   381,516,000 225,970,000 918,731,000 657,014,000       64,000,000 69,400,000  
Operating income   18,819,000 8,431,000 44,398,000 25,127,000       400,000 400,000  
Business Combination, Acquisition Related Costs                   $ 2,000,000