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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Estimated Useful Lives of Intangible Assets Acquired

Intangible assets acquired individually or with a group of other assets or in a business combination are carried at cost less accumulated amortization based on their estimated useful lives as follows:

 

Customer-related intangible assets

      1-14 years   

Marketing-related intangible assets

      1-10 years   

Contract-related intangible assets

      1 year   

Other intangible assets

      3-9 years