v2.4.0.8
Income Tax - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Tax Credit Carryforward [Line Items]      
Utilization of NOL and tax credit carryforwards due to ownership changes 50.00%    
Interest or penalties related to uncertain tax positions $ 0 $ 0 $ 0
Liabilities For Interest and Potential Penalties 0 0  
Federal net operating loss [Member]
     
Tax Credit Carryforward [Line Items]      
Net operating loss carryforward 182    
State NOL [Member]
     
Tax Credit Carryforward [Line Items]      
Net operating loss carryforward $ 107