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Summary of Significant Accounting Policies - Summary of Cash Dividend Declared (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]        
Cash dividends declared per share $ 0.11us-gaap_CommonStockDividendsPerShareDeclared $ 0.41us-gaap_CommonStockDividendsPerShareDeclared $ 0.10us-gaap_CommonStockDividendsPerShareDeclared $ 1.00us-gaap_CommonStockDividendsPerShareDeclared