Valuation And Qualifying Accounts (Detail) (Allowance for doubtful accounts receivable, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 5,717		$ 5,869		$ 5,934
Charged to costs and expenses	1,871		921		774
Charged to other accounts	0		0		0
Other	(1,702)	[1]	(992)	[1]	(1,018)	[1]
Balance at end of period	5,497		5,717		5,869
Foreign Currency Translation [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Cumulative translation adjustment	$ (389)		$ (81)		$ 179

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