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Acquisitions - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended
Jul. 31, 2015
USD ($)
Employee
Jun. 30, 2015
USD ($)
Aug. 31, 2014
USD ($)
Aug. 31, 2015
USD ($)
Aug. 31, 2014
USD ($)
Jul. 07, 2015
USD ($)
May. 31, 2015
USD ($)
Business Acquisition [Line Items]              
Business acquisition, goodwill       $ 262,194     $ 107,773
Business acquisition total consideration, net of cash acquired       $ 263,560 $ 2,151    
Minimum [Member]              
Business Acquisition [Line Items]              
Acquired intangible asset useful life 1 year            
Maximum [Member]              
Business Acquisition [Line Items]              
Acquired intangible asset useful life 15 years            
Mechanical Service [Member]              
Business Acquisition [Line Items]              
Business acquisition, purchase price   $ 12,600          
Business acquisition, contingent consideration   2,000          
Business acquisitions, cash acquired   100          
Business acquisition, net working capital   3,000          
Business acquisition, fixed assets   600          
Business acquisition, goodwill and intangible assets   9,100          
Business acquisition, goodwill   $ 4,100          
Business acquisition, contingent consideration thresholds period   3 years          
Business acquisition, contingent consideration based upon achievement of performance targets   $ 4,000          
Mechanical Service [Member] | United Kingdom [Member]              
Business Acquisition [Line Items]              
Business acquisition, contingent consideration     $ 300   300    
Business acquisitions, cash acquired     200        
Business acquisition, goodwill and intangible assets     1,000   1,000    
Business acquisition total consideration, net of cash acquired     3,100        
Business acquisition, allocated to fixed assets and net working capital     $ 2,100   $ 2,100    
Qualspec Group [Member]              
Business Acquisition [Line Items]              
Business acquisition, purchase price $ 257,000            
Business acquisition, contingent consideration 10,000            
Increase in revenue due to acquisition $ 180,000            
Number of employees added | Employee 1,000            
Business acquisition, fixed assets           $ 15,472  
Business acquisition, goodwill           $ 151,732