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Assets Measured at Fair Value on Recurring Basis for PBOP Plan (Detail) (Other Postretirement Benefit Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis $ 10,829 $ 8,301
Equity Funds
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 1,673 1,274
Fixed Income Securities
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 4,689 3,670
Index Funds
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 4,467 3,357
Fair Value, Inputs, Level 1
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 10,829 8,301
Fair Value, Inputs, Level 1 | Equity Funds
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 1,673 1,274
Fair Value, Inputs, Level 1 | Fixed Income Securities
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis 4,689 3,670
Fair Value, Inputs, Level 1 | Index Funds
    
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]    
Assets measured at fair value on recurring basis $ 4,467 $ 3,357