SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - ALLOWANCE FOR DOUBTFUL ACCOUNTS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 8,600
Balance at End of Year	10,300	$ 8,600
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	8,636	8,026	$ 8,783
Additions Charged to Income	1,949	2,156	1,618
Accounts Receivable Write-offs	(596)	(862)	(1,387)
Translation and Other	266	(684)	(988)
Balance at End of Year	$ 10,255	$ 8,636	$ 8,026