Fair Values of Financial Instruments - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Purchases, issuances, and settlements
Fair Value, Measurements, Recurring | Interest rate swap liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		7,797
Included in net income		(863)
Transfers in/(out) of Level 3		(6,934)
Ending balance
Fair Value, Measurements, Recurring | Available for Sale Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	18,328	20,838
Included in other comprehensive income	1,330	(1,141)
Purchases, issuances, and settlements	7,590
Transfers in/(out) of Level 3	(16,434)
Principal (payments)/additions	(837)	(1,369)
Ending balance	9,977	18,328
Fair Value, Measurements, Recurring | Interest rate swap asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		5,241
Included in net income		(860)
Included in other comprehensive income		481
Transfers in/(out) of Level 3		(4,862)
Ending balance
Fair Value, Measurements, Recurring | Interest rate cap
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		424
Included in other comprehensive income		(15)
Transfers in/(out) of Level 3		(409)
Ending balance