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CONTINGENCIES (Detail) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 22, 2015	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 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

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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Loss Contingency, Claims Dismissed, Period To File An Amendment Or Notice To Stand On The Amended Complaint

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Number of legal proceedings that have material effect.

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