Annual report pursuant to Section 13 and 15(d)

Intangibles Asset Estimated Useful Lives (Detail)

v2.4.0.6
Intangibles Asset Estimated Useful Lives (Detail)
 12 Months Ended
Dec. 31, 2012
Customer Lists and Contracts
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life, description Lesser of 5 years or life of contract
Favorable and Assigned Leases
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life, description Life of the lease
Domain and Brand Names
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 5 years
Internally Developed Software | Minimum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 3 years
Internally Developed Software | Maximum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 5 years
Customer Relationship | Minimum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 1 year
Customer Relationship | Maximum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 3 years
Other Amortizable Intangible Assets | Minimum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 5 years
Other Amortizable Intangible Assets | Maximum
  
Finite-Lived Intangible Assets [Line Items]  
Finite lived intangible assets useful life 10 years