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Basis of Presentation - Revision of Other Assets and Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred tax assets, net | $ 9,828 | $ 9,497 | $ 10,274
Long-term income tax receivable | 19,411 | 17,720 | 15,281
Other | 1,959 | 2,195 | 1,992
Total other assets | 31,198 | 29,412 | 27,547
Long-term income tax payable | 44,309 | 38,600 | 31,365
Accrued compensation | 21,078 | 18,750 | 15,174
Other | 5,004 | 3,745 | 953
Total other liabilities | 70,391 | 61,095 | 47,492
As Previously Reported [Member] |  |  |
Deferred tax assets, net |  | 9,497 | 10,274
Other |  | 2,195 | 1,992
Total other assets |  | 11,692 | 12,266
Long-term income tax payable |  | 20,880 | 16,084
Accrued compensation |  | 18,750 | 15,174
Other |  | 3,745 | 953
Total other liabilities |  | 43,375 | 32,211
Adjustment [Member] |  |  |
Long-term income tax receivable |  | 17,720 | 15,281
Total other assets |  | 17,720 | 15,281
Long-term income tax payable |  | 17,720 | 15,281
Total other liabilities |  | $ 17,720 | $ 15,281

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