Annual report pursuant to Section 13 and 15(d)

Line Of Credit And Short-Term Borrowings - Additional Information (Detail)

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Line Of Credit And Short-Term Borrowings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Jun. 30, 2009
Bank
Amount of secured credit agreement     $ 250.0
Number of syndicate banks in agreement     7
Amount of previous credit agreement   150  
Maturity date of amended credit agreement   Jun. 30, 2015  
Line of credit, subsidiaries   250.0  
Maximum amount of credit facility 300.0 300.0  
Line of credit facility, interest rate description   LIBOR  
Line of credit facility, interest rate   LIBOR plus 1.00%  
Line of credit facility Interest rate based on federal funds rate   0.50%  
Interest rate of line of credit agreement 1.00% 1.00%  
Percentage of average daily principal balance of revolving loans under the credit agreement   1.00%  
Percentage of average daily principal balance of revolving loans under the credit agreement   1.25%  
Percentage of average daily principal balance of revolving loans for base rate loans   1.50%  
Average daily principal balance of revolving loans under the credit agreement on LIBOR rate   2.00%  
Average daily principal balance of revolving loans under the credit agreement on Federal Funds Rate   2.25%  
Average daily principal balance of revolving loans under the credit agreement on LIBOR loans   2.50%  
Unused line of credit fee 0.375% 0.50%  
Maximum limit for letters of credit   50.0  
Maximum excess availability for credit agreement   40.0  
Syndication and commitment fees   $ 6.7