ACQUISITIONS Allocation of Total Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands		9 Months Ended
	Apr. 04, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 491,999		$ 290,710
Purchase consideration, net of cash acquired		236,091	$ 2,504
Sotera
Business Acquisition [Line Items]
Cash	$ 11,583
Receivables	37,795
Prepaid expenses	1,679
Property and equipment	1,499
Other intangibles	23,450
Goodwill	201,289
Deferred tax assets	142
Other assets	1,149
Total assets acquired	278,586
Accounts payable	7,007
Accrued expenses	9,518
Accrued salaries and wages	10,784
Deferred revenue	1,505
Long-term obligations	2,098
Total liabilities assumed	30,912
Net assets acquired	247,674
Purchase consideration, net of cash acquired	$ 236,100	236,091
Actual cash paid		$ 247,674