Reconciliation of Change in Unrecognized Tax Benefit (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits [Line Items]
Total unrecognized tax benefits at January 1	$ 5,296	$ 4,510	$ 5,238
Gross increases for tax positions of prior years	208	1,449	1,396
Gross decreases for tax positions of prior years	(118)	(364)	(2,042)
Gross increases for tax positions of current year	1,322	301	646
Increases due to acquisitions		2,412
Settlements	(903)	(1,434)	(464)
Lapse of statute of limitations	(301)	(1,513)	(221)
Changes due to currency fluctuations	130	(65)	(43)
Total unrecognized tax benefits at December 31	$ 5,634	$ 5,296	$ 4,510