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Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2009
Jan. 22, 2009
Equity [Abstract]        
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding    
Authorization for purchase of company's common stock       $ 10.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Purchase common stock shares 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 349,800us-gaap_TreasuryStockSharesAcquired  
Average cost of per share     $ 2.67us-gaap_TreasuryStockAcquiredAverageCostPerShare  
Purchase common stock value     $ 0.9us-gaap_TreasuryStockValueAcquiredCostMethod