Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Operating Loss Carryforwards [Line Items]
Reserved deferred tax amount	75.7
Federal [Member]
Operating Loss Carryforwards [Line Items]
Federal income tax returns subject to examination description	Federal income tax returns of the Company are subject to IRS examination for the 2012 and 2013 tax years.
State [Member]
Operating Loss Carryforwards [Line Items]
Federal income tax returns subject to examination description	State income tax returns are subject to examination for a period of three to four years after filing.