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Basis of Presentation - Revisions in the Balance Sheet Line Items (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Other assets | $ 31,198 | $ 29,412 | $ 27,547
Other liabilities | 70,391 | 61,095 | 47,492
As Previously Reported [Member] |  |  |
Other assets |  | 11,692 | 12,266
Other liabilities |  | 43,375 | 32,211
Adjustment [Member] |  |  |
Other assets |  | 17,720 | 15,281
Other liabilities |  | $ 17,720 | $ 15,281

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