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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]          
Deferred tax benefits including income tax expense $ 4,400,000   $ 8,800,000    
Valuation allowance 72,700,000   72,700,000    
Net deferred tax assets 73,200,000   73,200,000    
Income tax expense (benefit), including discrete items 104,000 (15,000) 21,000 169,000  
Uncertain income tax (less than)     Less than a 50% likelihood    
Total liability for unrecognized tax benefits included other long-term liabilities     199,000   367,000
Interest expense related to uncertain tax positions 1,000   168,000    
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2008 taxable year     $ 71,000