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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 24, 2010
Acquired Finite-Lived Intangible Assets [Line Items]                        
Disposal or recognition of additional goodwill                 $ 0      
Impairment charges on goodwill                 0      
Goodwill balance 1,316,000       1,316,000       1,316,000 1,316,000   1,316,000
Amortization expenses of intangible assets 51,000 50,000 51,000 50,000 51,000 50,000 51,000 50,000 202,000 202,000 202,000  
Impairment charges recognized related to the acquired intangible assets                 0 0    
Annual amortization expense of the intangible assets, 2014 200,000               200,000      
Annual amortization expense of the intangible assets, 2015 200,000               200,000      
Annual amortization expense of the intangible assets, 2016 200,000               200,000      
Annual amortization expense of the intangible assets, 2017 200,000               200,000      
Annual amortization expense of the intangible assets, 2018 200,000               200,000      
Annual amortization expense of the intangible assets, 2019 200,000               200,000      
Annual amortization expense of the intangible assets, 2020 $ 100,000               $ 100,000