Income Taxes (Detail) - Reconcilliation of Beginning and Ending Amout of Unrecognized Tax Benefits, Excluding Interest and Penalties (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Beginning balance	$ 18,345	$ 15,824
Additions based on tax positions related to the current year	4,301	2,269
Additions for tax positions of prior years	105	4,375
Reductions for tax positions of prior years	(3,427)	(746)
Reductions for expiration of statutes	(296)	(269)
Settlements	(1,372)	(2,661)
Change in foreign currency exchange rates	(104)	(447)
Ending balance	$ 17,552	$ 18,345