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Note 8 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Detail) (USD $)
 1 Months Ended 5 Months Ended 6 Months Ended 7 Months Ended 18 Months Ended 60 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 18 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2011
Dec. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 31, 2016
Jun. 30, 2012
Dec. 31, 2015
Jun. 30, 2016
Jan. 31, 2012
Sep. 30, 2011
Oct. 31, 2007
Oct. 31, 2007
RHB [Member]
Dec. 31, 2011
Myers & Sons Construction L.P. [Member]
Jun. 30, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Jun. 30, 2012
Aggregate Industries-SWR [Member]
Jun. 30, 2012
RHB [Member]
Apr. 27, 2012
RHB [Member]
Jun. 30, 2012
RLW [Member]
Dec. 31, 2012
RLW [Member]
Jun. 30, 2012
RLW [Member]
Jun. 30, 2012
Other Noncontrolling Interest Owners [Member]
Noncontrolling Interest, Description                                   six            
Deferred Revenue                 $ 25,000,000                              
Noncontrolling Interest, Ownership Percentage by Parent                                       50.00%        
Noncontrolling Interests Offer To Buy Percentage                                     50.00%          
Noncontrolling Interests Offer To Sell Percentage                                     50.00%          
Non Controlling Interests Offer To Buy, Counter Offer Percentage                                     50.00%          
Noncontrolling Interests Require To Buy, Percentage                                     50.00%          
Noncontrolling Interests Require To Sell, Percentage                                     50.00%          
Long-term Line of Credit                                     5,000,000          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value     15,200,000     15,200,000                                    
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment     1,200,000     1,200,000                                    
Revenues From Contracts Assumed and Acquired           10,300,000                                    
Earnings From Contracts Assumed and Acquired           300,000                                    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 80.00% 50.00%                     50.00%                      
Business Acquisition Additional Price Payments 5,000,000   2,200,000                                          
Business Acquisition Additional Price Payments Term 5 years                                              
Business Acquisition Earn-Out Percentage 50.00%                                              
Business Acquisition Earn-Out Calculated Floor         1,200,000   2,000,000                                  
Forcasted EBITDA Percentage     0.39     0.39   0.77                                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 2,400,000                                              
Business Acquisition Undiscounted Earn-Out Liability     2,400,000     2,400,000                                    
Business Acquisition Undiscounted Earn-Out Liability Increase     2.6     2.6                                    
EBITDA Earn-Out Increase Floor     5,200,000     5,200,000                                    
Business Acquisition Purchase Price Multiplier                           4   4.5                
EBITDA Increase (Decrease)                                           1,000,000    
Increase (Decrease) in Put/Call Liability                                         1,195,000 300,000    
Interest Expense, Other     497,000 424,000                                        
Other Tax Expense (Benefit)                                         378,000      
    21,800,000     21,800,000                         1,204,000   10,576,000   10,576,000 296,000
Equity Method Investment, Ownership Percentage                       91.67%                        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                   8.20% 8.33%                          
Business Acquisition Purchase Price Increase                             7,100,000   8,200,000              
Business Acquisition Net Accrued Amount To Noncontrolling Interest                     1,100,000                          
Noncontrolling Owners' Interest In Earnings of Subsidiaries and Joint Ventures     12,076,000                                          
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest                                             6,717,000  
Increase (Decrease) in Income Taxes                                             $ 2,351,000