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Parent Company Only Condensed Financial Information - Condensed Statements of Operations and Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Items Net Interest And Other Financial Income [Line Items]      
Interest income $ 7,268 $ 9,656 $ 12,617
Interest expense 2,633 3,478 4,183
Loss before income tax and undistributed subsidiaries' operations (3,766) (5,425) (6,672)
Net loss (3,766) (5,425) (6,870)
Comprehensive loss (4,045) (5,711) (6,902)
Parent Company [Member]
      
Other Items Net Interest And Other Financial Income [Line Items]      
Interest income 3    
Interest expense 180 168 167
Other expense 400 663 567
Loss before income tax and undistributed subsidiaries' operations (577) (831) (734)
Effect of subsidiaries' operations (3,189) (4,594) (6,136)
Net loss (3,766) (5,425) (6,870)
Comprehensive loss $ (4,045) $ (5,711) $ (6,902)