Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Unrecognized tax benefits at beginning of period	$ 13,143	$ 12,864	$ 17,285
Gross change for prior period positions	1,425	47	(5,120)
Gross change for current year positions	640	1,036	1,630
Decrease due to settlements and payments	0	0	(255)
Decrease due to statute expirations	(123)	(424)	(1,026)
Increase due to effect of foreign currency translation	0	0	350
Decrease due to effect from foreign currency translation	(129)	(380)	0
Unrecognized tax benefits at end of period	$ 14,956	$ 13,143	$ 12,864