Derivative Financial Instruments - Summary of Impact of Derivative Financial Instruments to Consolidated Statement of Operations and Consolidated Statement of Comprehensive Income (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain on termination of residual interest rate swaps	$ 136,000
Number of interest rate swap agreements terminated	5
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps, termination period	June 2013