Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Unrecognized tax benefits at beginning of period	$ 14,956	$ 13,143	$ 12,864
Gross change for prior period positions	(3,029)	1,425	47
Gross change for current year positions	268	640	1,036
Decrease due to settlements and payments	0	0	0
Decrease due to statute expirations	0	(123)	(424)
Increase due to effect of foreign currency translation	0	0	0
Decrease due to effect from foreign currency translation	69	(129)	(380)
Unrecognized tax benefits at end of period	$ 12,264	$ 14,956	$ 13,143