Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Deferred tax assets valuation allowances	$ 1.6	$ 6.9
Income Tax rate		34.00%	34.00%	34.00%
Maximum
Income Taxes [Line Items]
Tax sharing agreement,operating loss carryforwards, aggregate future payments		1.6
Income Tax rate		35.00%
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards		4.6
Operating loss carryforwards, if unused, expiration year		2019
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Net operating loss carryforwards		$ 15.7
Operating loss carryforwards, if unused, expiration year		2020