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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units
The following table presents the significant estimates used by management in determining the fair values of Quanta’s reporting units at December 31, 2017, 2016 and 2015:
 
 
2017
 
2016
 
2015
Years of cash flows before terminal value
 
5 years
 
5 years
 
5 years
Discount rates
 
12.0% to 14.0%
 
12.5% to 14.5%
 
12.0% to 16.0%
EBITDA multiples
 
5.5 to 7.0
 
5.5 to 7.0
 
5.0 to 6.5
Weighting of three approaches:
 
 
 
 
 
 
Discounted cash flows
 
70%
 
70%
 
70%
Market multiple
 
15%
 
15%
 
15%
Market capitalization
 
15%
 
15%
 
15%
Fair Value Measurement Inputs for Acquisition
The following table presents the significant estimates used by management in determining the fair values of customer relationships associated with acquisitions in the years ended December 31, 2017, 2016 and 2015:
 
 
2017
 
2016
 
2015
Discount rates
 
17% to 25%
 
20% to 23%
 
18% to 22%
Customer attrition rates
 
15% to 78%
 
10% to 70%
 
14% to 70%