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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail)
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]        
Shares outstanding at beginning of year   43,130,000us-gaap_SharesOutstanding 42,784,000us-gaap_SharesOutstanding 42,650,000us-gaap_SharesOutstanding
Shares repurchased (755,310)us-gaap_StockRepurchasedDuringPeriodShares (464,190)us-gaap_StockRepurchasedDuringPeriodShares   (374,000)us-gaap_StockRepurchasedDuringPeriodShares
Treasury shares issued for:        
Restricted stock awards   162,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 86,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 76,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
401(k) plan   116,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan 123,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan 152,000us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Employee stock options exercised   110,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 137,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 280,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Shares outstanding at end of year 43,054,000us-gaap_SharesOutstanding 43,054,000us-gaap_SharesOutstanding 43,130,000us-gaap_SharesOutstanding 42,784,000us-gaap_SharesOutstanding