Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes [Line Items]
Effective tax rate, benefit percentage	53.00%	23.30%
Earnings of foreign entities	$ 8,900,000	$ 9,700,000
Recognition of tax benefit	(2,444,000)	(555,000)
Unrecognized tax benefit for uncertain tax positions	15,000,000		13,100,000
Accrued interest and penalties related to income tax liabilities	2,000,000		1,800,000
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits	1,400,000
2012 American Taxpayer Relief Act
Income Taxes [Line Items]
Recognition of tax benefit	1,400,000
ORCC
Income Taxes [Line Items]
Increase in unrecognized tax benefits for uncertain tax positions	1,500,000
PTESA
Income Taxes [Line Items]
Increase in unrecognized tax benefits for uncertain tax positions	$ 400,000