Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Federal and state income tax expense	$ 0.3	$ 0.3
Unrecognized tax benefits	0	0
Interest or penalties related to uncertain tax positions	0	0
Current prepaid taxes	0.1
Deferred tax liability	$ 0.9
Tax years open to examination	2010-2013