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Amortizable Intangible Assets - Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 1,395,388 $ 1,148,834
Accumulated Amortization (589,689) (529,946)
Net Carrying Value 805,699 618,888
Purchased customer accounts [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 1,365,973 1,120,719
Accumulated Amortization (564,053) (505,137)
Net Carrying Value 801,920 615,582
Weighted Average Life (Years) 15 years 14 years 10 months 24 days
Non-compete agreements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 29,415 28,115
Accumulated Amortization (25,636) (24,809)
Net Carrying Value $ 3,779 $ 3,306
Weighted Average Life (Years) 6 years 9 months 18 days 7 years