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Derivative Instruments - Derivative Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet $ 33,292 $ 33,317
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets 133 53
Net Amount, Derivative Assets    82
Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 2,213 3,579
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 2,080 3,444
Counterparty B [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets      
Counterparty B [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 17 24
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 17 24
Counterparty D [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets      
Counterparty D [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 246 566
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 246 566
Counterparty E [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets      
Counterparty E [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 1,046 1,696
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 1,046 1,696
Counterparty F [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets    82
Counterparty F [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 233 355
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 233 273
Counterparty G [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets      
Counterparty G [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 133 251
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 133 251
Counterparty I [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets      
Net Amount, Derivative Assets      
Counterparty I [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 405 634
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets 405 634
Counterparty J [Member]
    
Derivative [Line Items]    
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets 133 53
Net Amount, Derivative Assets      
Counterparty J [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]
    
Derivative [Line Items]    
Net Amount Presented in the Balance Sheet 133 53
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets