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Pension Plan (Detail) - Schedule of Level Three Defined Benefit Plan Assets Roll Forward (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Guaranteed investment contracts [Member] | Fair Value, Inputs, Level 1 [Member]
 
Fair Value, Pension plan assets   
Guaranteed investment contracts [Member] | Fair Value, Inputs, Level 2 [Member]
 
Fair Value, Pension plan assets 2,016
Guaranteed investment contracts [Member] | Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Pension plan assets   
Guaranteed investment contracts [Member] | Netting [Member]
 
Fair Value, Pension plan assets 2,016
Mutual Stock Funds [Member] | Fair Value, Inputs, Level 1 [Member]
 
Fair Value, Pension plan assets 1,023
Mutual Stock Funds [Member] | Fair Value, Inputs, Level 2 [Member]
 
Fair Value, Pension plan assets   
Mutual Stock Funds [Member] | Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Pension plan assets   
Mutual Stock Funds [Member] | Netting [Member]
 
Fair Value, Pension plan assets 1,023
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
 
Fair Value, Pension plan assets   
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
 
Fair Value, Pension plan assets 2,725
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Pension plan assets   
Equity Funds [Member] | Netting [Member]
 
Fair Value, Pension plan assets 2,725
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
 
Fair Value, Pension plan assets 41
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
 
Fair Value, Pension plan assets   
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Pension plan assets   
Money Market Funds [Member] | Netting [Member]
 
Fair Value, Pension plan assets 41
Fair Value, Inputs, Level 1 [Member]
 
Fair Value, Pension plan assets 1,064
Fair Value, Inputs, Level 2 [Member]
 
Fair Value, Pension plan assets 4,741
Fair Value, Inputs, Level 3 [Member]
 
Fair Value, Pension plan assets   
Netting [Member]
 
Fair Value, Pension plan assets $ 5,805