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 $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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)			$ (643)	$ 132
Amount of gain (loss) reclassified from accumulated other comprehensive income into income as interest expense (effective portion)			5	1
Amount of gain (loss) recognized in income on derivative (in effective portion and amount excluded from effectiveness testing)	$ 0	$ 0	$ 0	$ 0