Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Trust preferred securities	$ 32.0
Bank payment on corresponding notional amount fixed rate/ Basis for determining strike rate on purchased interest rate cap		30-Day Libor rate
Interest rate swap agreement maturity date	2018-01
Fair value of Interest rate swap, record as liability		0.3	1.1
Notional amount of sold interest rate cap				100
Strike rate of sold interest rate cap in basis points above strike rate on purchased interest rate cap				1.25%
Payments made under interest rate cap contracts		0
Interest rate swap agreement [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Bank payment on corresponding notional amount fixed rate/ Basis for determining strike rate on purchased interest rate cap		90-Day Libor Rate
Trust preferred securities interest rate index		90-Day Libor Rate
Fixed spread added to the variable rate on our trust preferred securities	218
Notional amounts of interest rate swap agreement and purchased interest rate cap	32.0
Interest rate cap contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amounts of interest rate swap agreement and purchased interest rate cap				$ 100.0