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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Aug. 31, 2012
Aug. 31, 2013
May 31, 2013
Aug. 31, 2012
TCI Services, Inc.
Aug. 31, 2012
TCI Services, Inc.
Customer relationships
Aug. 31, 2012
TCI Services, Inc.
Trade names
Aug. 31, 2012
Specialty Remote Digital Video Inspection Company
Aug. 31, 2012
Specialty Remote Digital Video Inspection Company
Customer relationships
Aug. 31, 2012
Specialty Remote Digital Video Inspection Company
Non-compete agreements
Nov. 03, 2010
Quest Integrity
Nov. 03, 2010
Quest Integrity
Minimum
Jul. 31, 2013
Global Ascent, Inc.
Jul. 31, 2013
Global Ascent, Inc.
Customer relationships
Jul. 31, 2013
Global Ascent, Inc.
Maximum
Business Acquisition [Line Items]                            
Business acquisition, cash paid       $ 16,500,000               $ 10,800,000    
Business acquisition, additional consideration                           4,000,000
Business acquisition performance measurement period                       6 years    
Business acquisition, net working capital       4,100,000               900,000    
Business acquisition, fixed assets       2,600,000     700,000         100,000    
Business acquisition, goodwill   108,977,000 103,466,000 8,600,000     900,000         5,800,000    
Business acquisition, intangible assets         6,700,000 1,100,000   1,100,000 300,000       6,000,000  
Contingent consideration       1,900,000               2,000,000    
Business acquisition, purchase price 26,000,000     23,200,000     3,000,000              
Deferred payments for common stock       6,700,000                    
Business acquisition, other current liabilities       1,000,000                    
Business acquisition, other long-term liabilities       5,700,000                    
Future contingent consideration liability 1,000,000     1,900,000                    
Combined annual revenues from acquired businesses 24,000,000                          
Business acquisition, expected deductible goodwill recognized for tax purposes 6,700,000                          
Purchase percentage of quest                   95.00%        
Remaining purchase consideration based upon future financial performance                   5.00%        
Expected date of purchase of remaining purchase consideration                   2015        
Business acquisition, stock issued and issuable at fair value                     2,400,000      
Percentage of aggregate value consideration of outstanding common stock                   20.00%        
Value of remaining acquisition                   $ 4,900,000