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Intangible Assets Acquired Either Individually or with Group of Other Assets or in Business Combination (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 337,473 $ 340,372
Accumulated amortization 230,541 227,985
Net 106,932 112,387
Customer-Related Intangible Assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 286,716 291,735
Accumulated amortization 207,466 206,987
Net 79,250 84,748
Marketing-Related Intangible Assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 40,654 40,386
Accumulated amortization 20,026 18,801
Net 20,628 21,585
Contract-Related Intangible Assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 1,028 1,182
Accumulated amortization 1,028 1,182
Other Intangible Assets
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 9,075 7,069
Accumulated amortization 2,021 1,015
Net $ 7,054 $ 6,054