Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net asset position of derivative counterparties	$ 48,000		$ 48,000
Net liability position of derivative counterparties	921,000		921,000
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives recorded losses during the period	528,000	$ 748,000	2,200,000	$ 759,000
Interest Rate Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification from accumulated other comprehensive income as increase to interest expense			1,400,000
Cash flow hedge ineffectiveness	$ 0	$ 0	$ 0	$ 0