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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Aug. 23, 2014
HDB, Inc. [Member]
Aug. 22, 2014
HDB, Inc. [Member]
Dec. 21, 2013
Kvaerner NAC
Sep. 30, 2014
Kvaerner NAC
Business Acquisition [Line Items]              
Business Acquisition, Effective Date of Acquisition       Aug. 22, 2014   Dec. 21, 2013  
Business Acquisition, Percentage of Voting Interests Acquired           100.00%  
Business Acquisition, Name of Acquired Entity       HDB Ltd. Limited Partnership ("HDB").   Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc  
Business Combination, Consideration Transferred       $ 5,250,000   $ 88,300,000  
Goodwill 72,065,000   69,837,000     39,232,000  
Tax deductible goodwill         2,586,000 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 1,000,000
Noncontrolling interest of consolidated joint venture           700,000 500,000
Revenues 321,683,000 226,217,000          
Operating income $ 8,547,000 $ 10,762,000