Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 905,000	$ 3,269,000	$ 2,351,000	$ 6,001,000
Effective tax rates	18.50%	20.90%	93.90%	17.30%
Statutory tax rate			35.00%	35.00%
Valuation allowance for deferred tax assets	94,700,000		94,700,000		90,400,000
Increase (Decrease) in valuation allowance	3,100,000	100,000	4,300,000	200,000
Benefit of net operating loss carryforwards	4,500,000		4,500,000
Increase in valuation allowance to account for changes in other comprehensive income (loss)	200,000		200,000
Effective income tax rate, excluding change release of valuation allowance	81.10%	21.60%	88.10%	18.00%
Unrecognized tax benefits	6,200,000		6,200,000		5,100,000
Increase in uncertain tax positions primarily related to uncertain tax positions in Europe	$ 600,000	$ 300,000	$ 1,100,000	$ 0