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Allowance for Doubtful Accounts (Tables)
 6 Months Ended
Jun. 30, 2013
Receivables [Abstract]  
Summary of Allowance for Doubtful Accounts
     Balance at
Beginning of
Period		      Charged to
Expense		      Deductions(1)     Balance at
End of
Period		  

Three months ended June 30, 2013

    $ 8,657         9,485         (9,050 )    $ 9,092   

Three months ended June 30, 2012

    $ 11,706         7,871         (11,551 )    $ 8,026   

 

(1) Deductions represent accounts written off, net of recoveries.