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Stockholder's Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 25 Months Ended
Mar. 01, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 10, 2012
Schedule Of Stockholders Equity [Line Items]          
Common stock, shares authorized   100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, par value   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Preferred stock, shares authorized   40,000,000us-gaap_PreferredStockSharesAuthorized   40,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, par value   $ 1us-gaap_PreferredStockParOrStatedValuePerShare   $ 1us-gaap_PreferredStockParOrStatedValuePerShare  
Unissued common stock reserved for stock - based incentive plans and convertible preferred stock issuance   6,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance   6,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance  
Sale of preferred stock 2,587,400us-gaap_PreferredStockSharesIssued        
Convertible preferred stock dividend, rate 6.25%us-gaap_PreferredStockDividendRatePercentage        
Conversion rate of preferred stock 6,912,756us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion        
Convertible preferred stock, conversion date Mar. 01, 2014        
Common stock repurchased, shares       2,200,000us-gaap_TreasuryStockSharesAcquired  
Common stock repurchased, value   $ 35.7us-gaap_TreasuryStockValueAcquiredCostMethod $ 11.7us-gaap_TreasuryStockValueAcquiredCostMethod $ 47.3us-gaap_TreasuryStockValueAcquiredCostMethod  
Board of Directors | Maximum          
Schedule Of Stockholders Equity [Line Items]          
Common stock repurchase authorized amount         $ 50us-gaap_StockRepurchaseProgramAuthorizedAmount1
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