ACQUISITIONS Allocation of Total Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 04, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 455,197	$ 455,197	$ 290,710
Net cash paid		0	$ 235,856	$ 2,504
Sotera [Member]
Business Acquisition [Line Items]
Cash	$ 11,583
Receivables	37,521
Prepaid expenses	1,679
Fixed assets	1,499
Intangibles	60,590
Goodwill	164,487
Deferred tax assets	142
Other assets	1,149
Total assets acquired	278,650
Accounts payable	7,007
Accrued expenses	9,818
Accrued salaries and wages	10,784
Deferred revenue	1,505
Long-term obligations	2,097
Total liabilities assumed	31,211
Net assets acquired	247,439
Net cash paid	$ 236,100	235,856
Actual cash paid		$ 247,439