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Earnings and Dividends per Share - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Earnings And Dividends Per Share [Abstract]  
Shares not included in computation of diluted Earning per share 200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Non forfeitable dividend rights with holders of common stock One-for-one basis
Number of unvested restricted stock awards outstanding that are not expected to vest 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Common Stock, dividends, per share, declared $ 0.066us-gaap_CommonStockDividendsPerShareDeclared
Common Stock, dividends, per share, Paid $ 0.066us-gaap_CommonStockDividendsPerShareCashPaid