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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
Aug. 31, 2015
USD ($)
Lawsuits
Dec. 31, 2014
Lawsuits
Commitments and Contingencies Disclosure [Line Items]    
Number of lawsuits 92  
Insurance coverage subject to deductible limit | $ $ 250  
Delaware Cases [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Number of lawsuits   2
Washington Case [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Number of lawsuits   1
Quest Integrity [Member]    
Commitments and Contingencies Disclosure [Line Items]    
Number of lawsuits   3