Valuation And Qualifying Accounts (Detail) - Allowance for doubtful accounts receivable - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 5,497	$ 5,717	$ 5,869
Charged to costs and expenses		309	1,871	921
Charged to other accounts		0	0	0
Other	[1]	(462)	(1,702)	(992)
Balance at end of period		4,975	5,497	5,717
Foreign Currency Translation [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Cumulative translation adjustment		$ (369)	$ (389)	$ (81)

[1] Uncollectible accounts written off, net of recoveries.