Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Income tax expense	$ 2,161,000	$ 905,000	$ 2,283,000	$ 2,351,000
Effective tax rates	16.60%	18.50%	46.10%	93.90%
Income taxes at the statutory rate			35.00%
Valuation allowance for deferred tax assets	89,800,000		89,800,000		90,000,000
Increase (Decrease) in valuation allowance	700,000	3,100,000	200,000	4,300,000
Benefit of net operating loss carryforwards					4,500,000
Increase in valuation allowance to account for changes in other comprehensive income					200,000
Effective income tax rate, excluding change release of valuation allowance	21.70%	81.10%	50.20%	88.10%
Unrecognized tax benefits	6,900,000		6,900,000		6,400,000
Increase in uncertain tax positions primarily related to uncertain tax positions in Europe	$ 200,000	$ 600,000	$ 500,000	$ 1,100,000