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Other - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 04, 2015
Other [Line Items]      
Quarterly dividend declared $ 0.0375us-gaap_CommonStockDividendsPerShareDeclared $ 0.0375us-gaap_CommonStockDividendsPerShareDeclared  
Dividend Declared      
Other [Line Items]      
Dividend declaration date     Mar. 04, 2015
Quarterly dividend declared     $ 0.0375us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember
Dividend payable date     May 15, 2015
Dividend declared, date of record     May 01, 2015
Dividend payable $ 520,000us-gaap_DividendsPayableCurrent
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember