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Restricted Shares Activity (Detail) (Parent Company, USD $)
12 Months Ended
Dec. 31, 2013
Parent Company
 
Restricted Shares Roll Forward - Number of Shares  
Unvested, December 31, 2012 114,816
Granted 87,123
Vested (35,005)
Forfeited (20,424)
Unvested, December 31, 2013 146,510
Restricted Shares Roll Forward - Weighted Average Grant Date Fair Value  
Unvested, December 31, 2012 $ 1,164.10
Granted $ 1,137.00
Vested $ 1,166.70
Forfeited $ 1,134.80
Unvested, December 31, 2013 $ 1,151.40