Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Unrecognized Tax Benefits [Line Items]
Balance of unrecognized tax benefits at beginning of year	$ 8,414	$ 10,916	$ 11,535
Increases for tax positions of prior years		398	5,469
Decreases for tax positions of prior years	(310)		(4,327)
Increases for tax positions established for the current period	750	421	19
Decreases for settlements with taxing authorities	(36)	(3,000)	(299)
Reductions resulting from lapse of applicable statute of limitation	(4,678)	(308)	(1,602)
Adjustment resulting from foreign currency translation	(128)	(13)	121
Balance of unrecognized tax benefits at end of year	$ 4,012	$ 8,414	$ 10,916