Fair Values of Financial Instruments - Transfer Between Levels 1, 2 and 3 and Reasons For Those Transfers (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013 Available-for-sale securities	Dec. 31, 2013 Held to Maturity Securities	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Interest rate swap liability	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) Available-for-sale securities	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Interest rate swap asset	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Interest rate cap	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) Interest rate swap liability	Dec. 31, 2013 Significant Unobservable Inputs (Level 3) Available-for-sale securities	Dec. 31, 2013 Significant Unobservable Inputs (Level 3) Held to Maturity Securities	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) Interest rate swap asset	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) Interest rate cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer between Levels 1, 2 and 3				$ 6,934	$ (350)	$ 4,862	$ 409	$ (6,934)	$ 350	$ (16,784)	$ (4,862)	$ (409)
Reason for Transfer	The interest rate swap and cap instruments were transferred from Level 3 to Level 2 as of March 31, 2012 due to the availability of additional valuation information. These instruments are valued using widely accepted valuation techniques including discounted cash flow analysis using observable inputs such as contractual terms and LIBOR-based rate curves.	Selected state and municipal securities were transferred from Level 2 to Level 3 due to limited availability of similar securities in active markets	Selected state and municipal securities were transferred from available for sale to held to maturity. These securities are valued at amortized cost and are no longer classified within the fair value hierarchy.