Annual report pursuant to Section 13 and 15(d)

Acquisition of TNT Energy, LLC - Purchase Price Allocation (Detail)

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Acquisition of TNT Energy, LLC - Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consideration:      
Cash paid $ 284 $ 1,015  
Fair Value of Assets Acquired and Liabilities Assumed:      
Goodwill 61,508 $ 72,074 $ 64,300
TNT      
Consideration:      
Cash paid 8,600    
Promissory note 2,000    
Contingent consideration 4,100    
Total Consideration 14,700    
Fair Value of Assets Acquired and Liabilities Assumed:      
Working capital, net 900    
Goodwill [1] 7,900    
Intangible assets 5,900    
Net Assets $ 14,700    
[1] Since our initial valuation on the date of the acquisition, we recorded a $1.7 million increase to goodwill related to adjustments in working capital, including $0.1 million in the second quarter of 2017. Goodwill is expected to be deductible for income tax purposes.