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Fair Value of Financial Instruments - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Interest rate swap liability
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period $ 7,797 $ 3,876
Total realized and unrealized gains and losses:    
Included in net income (863) 3,921
Transfers in/(out) of Level 3 (6,934)  
Balance at end of the period    7,797
Available-for-sale Securities
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 20,838 186
Total realized and unrealized gains and losses    
Included in net income   (400)
Included in other comprehensive income (1,141) 2,029
Transfers in/(out) of Level 3   18,711
Principal payments (1,369) (312)
Balance at end of the period 18,328 20,838
Interest rate swap asset
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 5,241 4,002
Total realized and unrealized gains and losses    
Included in net income (860) 3,827
Included in other comprehensive income 481 (2,588)
Transfers in/(out) of Level 3 (4,862)  
Balance at end of the period    5,241
Interest rate cap
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 424 1,109
Total realized and unrealized gains and losses    
Included in other comprehensive income (15) (685)
Transfers in/(out) of Level 3 (409)  
Balance at end of the period    $ 424