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Shareholders' Equity - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]        
Dividend declared     $ 181,000us-gaap_DividendsCommonStock  
Dividend declared per share $ 0.02us-gaap_CommonStockDividendsPerShareDeclared $ 0.01us-gaap_CommonStockDividendsPerShareDeclared $ 0.03us-gaap_CommonStockDividendsPerShareDeclared  
Dividend paid     $ 181,000us-gaap_PaymentsOfDividends $ 0us-gaap_PaymentsOfDividends