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CONTINGENCIES (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 22, 2015
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
claim
Commitments and Contingencies Disclosure [Abstract]      
Number of legal proceedings that might have a material effect on the results of operations | claim     0
Period to amend complaint or file notice 30 days    
Civil money penalty   $ 1,000  
Pending Litigation | SEPTA Second Amended Complaint      
Loss Contingencies [Line Items]      
Indemnification costs     $ 645