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Discontinued Operations - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Taiwan Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Promissory note receivable   $ 3,000,000   $ 3,000,000
Cash collected on note receivable $ 1,200,000 $ 1,800,000 $ 3,034,000