Income Taxes - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Taxes [Line Items]
Effective income tax rate	29.30%	32.60%
Federal statutory rate	35.00%
Gross deferred tax assets	$ 73,400,000		$ 77,200,000
Valuation allowance related to the foreign tax credit carryforwards	14,700,000		14,600,000
Accrued gross liabilities	636,000		636,000
Accrued interest and penalties for discontinued operations	441,000		418,000
Period of unrecognized tax benefits not expected to be recognized	12 months
Liabilities associated with uncertain tax positions	$ 1,100,000		$ 1,100,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Period of tax credit	10 years
Expiration period	2019