Derivative Financial Instruments - Additional Information (Detail)	Sep. 30, 2016	Dec. 31, 2015
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, cap interest rate	4.50%	4.50%
Interest Rate Swaps [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted average maturity period	7 years 9 months 18 days	10 years
Weighted average pay rate	5.03%	4.45%
Weighted average receive rate	3.77%	2.37%
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Weighted average maturity period	3 years 1 month 6 days	3 years 10 months 24 days