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Property and Equipment Estimated Lives (Detail)
6 Months Ended
Jun. 30, 2012
Building
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 20 years
Vehicles | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 2 years
Vehicles | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 5 years
Office and Other Equipment | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 2 years
Office and Other Equipment | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 5 years
Software | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 2 years
Software | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated lives 3 years