AMORTIZATION OF INTANGIBLE ASSETS Values Assigned to Intangible Assets (Other Than Goodwill) for Acquisitions (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Book Value	$ 59,726	$ 68,675
Amortized Intangible Assets, Accumulated Amortization	(12,081)	(11,630)
Amortized Intangible Assets, Net Book Value	47,645	57,045
Customer relationships and contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Book Value	57,564	66,513
Amortized Intangible Assets, Accumulated Amortization	(11,158)	(11,039)
Amortized Intangible Assets, Net Book Value	46,406	55,474
Software technology and other
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Book Value	2,162	2,162
Amortized Intangible Assets, Accumulated Amortization	(923)	(591)
Amortized Intangible Assets, Net Book Value	$ 1,239	$ 1,571