Derivative Financial Instruments - Gain or Loss Recognized in Financial Statements on Interest Rate Derivatives Designed as Cash Flow Hedges (Detail) (Cash Flow Hedging [Member], Interest Rate Hedges [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flow Hedging [Member] | Interest Rate Hedges [Member]
Derivative [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive income on interest rate derivatives (effective portion)	$ (147,000)	$ (1,000)
Amount of gain (loss) reclassified from accumulated other comprehensive income into income as interest expense (effective portion)	2,000
Amount of gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)