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Subsequent Event - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Jan. 31, 2015
Subsequent Event [Line Items]    
Dividend paid date Feb. 15, 2015  
Dividend declared date 2015-01  
Subsequent Events [Member]    
Subsequent Event [Line Items]    
Dividends on Preferred Stock   $ 300,000us-gaap_DividendsPreferredStock
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= us-gaap_SubsequentEventMember