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