Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives recorded losses during the period	$ 748,000	$ 759,000
Interest Rate Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash flow hedge ineffectiveness		0	$ 0
Reclassification from other accumulated comprehensive income as increase to interest expense		$ 367,000