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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]    
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.50us-gaap_CommonStockParOrStatedValuePerShare $ 0.50us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value per share $ 10.00us-gaap_PreferredStockParOrStatedValuePerShare $ 10.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Quarterly dividends declared and paid period The Company has declared and paid quarterly dividends beginning in May, 2013 through December, 2014.  
Dividend paid $ 23,800,000us-gaap_DividendsCash $ 18,000,000us-gaap_DividendsCash
Approved amount for open market repurchase of common stock   100,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of stock purchased under open market 1,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 631,096us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Stock purchased under open market amount 8,086,000us-gaap_PaymentsForRepurchaseOfCommonStock 9,232,000us-gaap_PaymentsForRepurchaseOfCommonStock
Available amount for open market repurchases under plan $ 82,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
Quarterly dividend temporarily suspended 2015-02