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Business Acquisitions - Schedule of Pro Forma Information Combines Consolidated Results of Company and Business Acquisitions (Parenthetical) (Detail)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Combinations [Abstract]                      
Effective tax rate                 37.44% 37.94% 38.29%
Effective tax rate, prior year                   37.94%  
Basic weighted average shares outstanding 99,469 99,506 99,116 98,618 98,226 97,876 97,086 96,538 99,112 97,386 95,412
Diluted weighted average shares outstanding 101,080 101,178 101,098 100,784 100,212 99,618 99,090 98,798 100,969 99,382 97,592