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Goodwill and Intangible Assets (Details Textual) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
May 31, 2014
May 31, 2014
May 31, 2013
ReportingUnit
May 31, 2012
Dec. 31, 2013
May 31, 2014
Maximum [Member]
May 31, 2014
Minimum [Member]
May 22, 2012
Navilyst [Member]
May 31, 2014
Navilyst [Member]
May 22, 2012
Navilyst [Member]
Trademark-NAMIC [Member]
May 31, 2014
Navilyst [Member]
Trademark-NAMIC [Member]
May 31, 2013
Income Approach Valuation Technique [Member]
May 31, 2013
Market Approach Valuation Technique [Member]
Goodwill and Intangible Assets (Textual) [Abstract]                            
Estimates useful life of intangible assets other than goodwill             20 years 3 years 10 years          
Acquired intangible asset                     $ 28,600,000 $ 28,600,000    
Number of reporting segments       2                    
Weight assigned to valuation methods                         75.00% 25.00%
Terminal value of the reporting unit   7.0 7.0                      
Discount rate used in fair value calculation     12.00%                      
Percentage of fair value, carrying value           7.00%                
Goodwill impairment 0                          
Change in carrying value of goodwill related to working capital   500,000               (2,257,000)        
Reduction in carrying value of goodwill       2,300,000                    
Change in carrying value of goodwill due to settlement       900,000                    
Increase in value of deferred tax assets       1,600,000                    
Preacquisition tax adjustments to goodwill       200,000                    
Amortization expense     $ 16,797,000 $ 16,345,000 $ 9,406,000