Estimated Useful Lives and Accumulated Depreciation for Assets (Detail)	9 Months Ended
	Sep. 30, 2013
Buildings
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	39 years
Furniture and equipment | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	3 years
Furniture and equipment | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	10 years
Vehicles | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	3 years
Vehicles | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	5 years
Software | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	3 years
Software | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated Useful Life	5 years