Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes [Line Items]
Effective tax rate	6.70%	106.60%	34.00%	398.10%
Effective tax rate reconciliation, favorable adjustment to uncertain tax positions	$ 3,900,000		$ 3,900,000
Effective tax rate reconciliation, reversal of related deferred tax assets	1,700,000		1,700,000
Operating income	10,504,000	2,269,000	17,295,000	751,000
Unrecognized tax benefits for uncertain tax positions	4,600,000		4,600,000		8,400,000
Unrecognized tax benefits for uncertain tax positions, liabilities for interest and penalties	2,300,000		2,300,000		2,200,000
Reasonably possible decrease in unrecognized tax benefits within the next 12 months	2,300,000		2,300,000
Foreign Entities
Income Taxes [Line Items]
Operating income	$ 10,200,000		$ 10,400,000