Registration of securities issued in business combination transactions

Summary of Significant Accounting Policies - Summary of Total Accounts and Notes Receivable (Detail)

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Summary of Significant Accounting Policies - Summary of Total Accounts and Notes Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Trade   $ 176,029 $ 184,817
Notes receivable   650 650
Allowance for doubtful accounts   (8,117) [1] (1,544) [1]
Total accounts and notes receivable, net of allowance for bad debt $ 249,623 $ 168,562 $ 183,923
[1] Additional information on the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 is reported on Schedule II - Valuation and Qualifying Accounts.