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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