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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Cash [Member]
 
Loss Contingencies [Line Items]  
Settlements on legal matters $ 6
Common Stock [Member]
 
Loss Contingencies [Line Items]  
Settlements on legal matters 5
Secured Promissory Note [Member]
 
Loss Contingencies [Line Items]  
Settlements on legal matters $ 5
Secured note interest rate percentage 5.00%
Secured note maturity period 30 months
September Fifteenth Two Thousand Eight [Member]
 
Loss Contingencies [Line Items]  
Lawsuit filing date September 15, 2008
September Eighteenth Two Thousand Eight [Member]
 
Loss Contingencies [Line Items]  
Lawsuit filing date September 18, 2008