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Investment in Equity Investee - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]        
Equity interest in CONTADO acquisition       19.99%
Equity interest in CONTADO, excess cost of investment over underlying equity in net assets       $ 9,000,000
Earnings of equity method investment $ 147,000 $ 1,140,000 $ 935,000  
Dividends Received from CONTADO 0 300,000 1,000,000  
Equity Method Investments [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity interest in CONTADO, amortization expense $ 300,000 $ 300,000 $ 300,000