XML 43 R32.htm IDEA: XBRL DOCUMENT v3.7.0.1
Legal and Regulatory Matters - Additional Information (Details) - California Labor Commission
$ in Millions
 1 Months Ended 12 Months Ended
May 16, 2017
USD ($)
Jul. 17, 2015
USD ($)
claimant
Mar. 06, 2015
class_action
claimant
Apr. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
claimant
Dec. 31, 2016
operator
Dec. 31, 2014
claimant
Dec. 31, 2012
operator
Loss Contingencies [Line Items]                
Number of owner operators (in operators) | operator           150   150
Number of claims heard by court (in claimants) | claimant   7 200   5   7  
Amount claimed   $ 2.9     $ 0.9      
Settlement amount awarded to other party $ 1.0     $ 0.9        
Number of class actions related to remaining claimants (in class actions) | class_action     3