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Cash - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents [Line Items]        
Cash $ 22,485 $ 25,634 $ 56,200 $ 55,199
Cash Deposited In an Affiliate Financial Institution [Member]
       
Cash and Cash Equivalents [Line Items]        
Cash $ 8,500 $ 14,500