• Filing Date: 2015-03-10
  • Form Type: 10-K
  • Description: Annual report
v2.4.1.9
Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 19, 2015
Subsequent Event [Line Items]        
Dividends per common share $ 1.10us-gaap_CommonStockDividendsPerShareDeclared $ 0.95us-gaap_CommonStockDividendsPerShareDeclared $ 0.88us-gaap_CommonStockDividendsPerShareDeclared  
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Dividends per common share       $ 0.30us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Date of dividend payable       Mar. 20, 2015
Record date of dividend payable       Feb. 20, 2015