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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Customer lists and contracts [Member]
Dec. 31, 2013
Customer lists and contracts [Member]
Mar. 31, 2014
Customer lists and contracts [Member]
Minimum [Member]
Mar. 31, 2014
Customer lists and contracts [Member]
Maximum [Member]
Mar. 31, 2014
Non-competition agreements [Member]
Dec. 31, 2013
Non-competition agreements [Member]
Mar. 31, 2014
Non-competition agreements [Member]
Minimum [Member]
Mar. 31, 2014
Non-competition agreements [Member]
Maximum [Member]
Mar. 31, 2014
Site locations [Member]
Dec. 31, 2013
Site locations [Member]
Mar. 31, 2014
Site locations [Member]
Maximum [Member]
Mar. 31, 2014
Other [Member]
Dec. 31, 2013
Other [Member]
Mar. 31, 2014
Other [Member]
Minimum [Member]
Mar. 31, 2014
Other [Member]
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]                                  
Estimated Life (Years)         7 years 10 years     3 years 15 years     15 years     5 years 15 years
Gross Carrying Amount $ 2,068,610 $ 2,065,875 $ 492,280 $ 492,299     $ 63,941 $ 63,933     $ 1,498,381 $ 1,495,635   $ 14,008 $ 14,008    
Accumulated Amortization 1,672,865 1,646,490 464,889 463,188     62,986 62,914     1,131,537 1,106,947   13,453 13,441    
Goodwill gross carrying amount 1,756,998 1,757,089                              
Goodwill accumulated amortization $ 253,536 $ 253,536