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Income Taxes and Other Taxes Payable (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards, Expiration Dates   20 years beginning 2029  
Corporate income tax, PRC 25.00% 25.00%  
Undistributed Earnings of Foreign Subsidiaries $ 10,500,000 $ 8,700,000 $ 2,500,000
Internal Revenue Service (IRS) [Member]
     
Operating Loss Carryforwards   87,000 0
State and Local Jurisdiction [Member]
     
Operating Loss Carryforwards   $ 87,000 $ 0