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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
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Available-for-sale Securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Balance at beginning of the period $ 19,878 $ 173 $ 20,838 $ 186
Total realized and unrealized gains and losses:        
Included in net income (loss)       (400)
Included in other comprehensive income (238) (82) (761) 240
Purchases, issuances and settlements            
Principal payments/additions 100 89 (337) 154
Ending balance at June 30, 2011 19,740 180 19,740 180
Interest Rate Swap Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Balance at beginning of the period   3,647 5,241 4,002
Total realized and unrealized gains and losses:        
Included in net income (loss)   586 (860) 112
Included in other comprehensive income   (450) 481 (331)
Purchases, issuances and settlements            
Transfers in/(out) of Level 3     (4,862)  
Ending balance at June 30, 2011   3,783   3,783
Interest Rate Cap
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Balance at beginning of the period   1,124 424 1,109
Total realized and unrealized gains and losses:        
Included in other comprehensive income   (170) (15) (155)
Purchases, issuances and settlements            
Transfers in/(out) of Level 3     (409)  
Ending balance at June 30, 2011   954   954
Interest Rate Swap Liabilities
       
Total realized and unrealized gains and losses:        
Balance at beginning of the period   (3,379) (7,797) (3,876)
Total realized and unrealized gains and losses:        
Included in net income (loss)   (607) 863 (110)
Included in other comprehensive income            
Purchases, issuances and settlements            
Transfers in/(out) of Level 3     6,934  
Principal payments/additions            
Ending balance at June 30, 2011   $ (3,986)   $ (3,986)