Annual report pursuant to Section 13 and 15(d)

FINANCIAL STATEMENT SCHEDULE (Detail) - Schedule of Valuation and Qualifying Accounts

v2.4.0.6
FINANCIAL STATEMENT SCHEDULE (Detail) - Schedule of Valuation and Qualifying Accounts (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Balance at Beginning of Period [Member]
Dec. 31, 2010
Balance at Beginning of Period [Member]
Dec. 31, 2012
Reductions [Member]
Dec. 31, 2011
Reductions [Member]
Dec. 31, 2012
Additions [Member]
Dec. 31, 2011
Additions [Member]
Dec. 31, 2012
Balance at End of Period [Member]
Dec. 31, 2011
Balance at End of Period [Member]
Allowance for doubtful accounts   $ 0 $ 0         $ 0 $ 0
Allowance for doubtful accounts       0          
Allowance for doubtful accounts           0      
Allowance for doubtful accounts   0 0         0 0
Allowance for settlements     1,553,000            
Allowance for settlements         (1,553,000)        
Valuation allowance for deferred taxes*   43,681,000 [1] 36,629,000 [1]         43,942,000 [1] 43,681,000 [1]
Valuation allowance for deferred taxes* 261,000         261,000 7,052,000    
Valuation allowance for deferred taxes*   $ 43,681,000 [1] $ 36,629,000 [1]         $ 43,942,000 [1] $ 43,681,000 [1]
[1] The 2012 and 2011 valuation allowance includes an adjustment to the prior year provision calculation due to changes recognized in the preparation of the actual returns.