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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative assets and liabilities offset in balance sheet $ 0    
Total notional amount of the Company's swaps 214.6   221.5
Gain recognized in the condensed consolidated statements of earnings $ 0 $ 0  
Interest-Rate Swap Agreements with Customers [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Number of interest-rate swap agreements 82    
Interest-Rate Swap Agreements with Counterparty Bank [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Number of interest-rate swap agreements 82