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Business Combinations - Results of Operations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 34,200 $ 28,200 $ 112,200  
Business Combination Pro Forma Information Income Loss Before Income Taxes Of Acquiree Since Acquisition Date Actual $ 4,300 1,500 (1,300)  
Two Thousand Fourteen Acquisitions [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Total revenues     1,630,162 $ 1,520,858
Income before income taxes     358,229 409,522
Net income     $ 218,150 $ 248,628
Net income per share:        
Basic (in dollars per share)     $ 1.51 $ 1.72
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted     $ 1.49 $ 1.70
Weighted Average Basic Shares Outstanding, Pro Forma     140,944 141,033
Weighted average number of shares outstanding:        
Pro Forma Weighted Average Shares Outstanding, Diluted     142,891 142,624
Two Thousand Fifteen Acquisitions [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Total revenues   1,688,297 $ 1,630,992  
Income before income taxes   411,497 356,426  
Net income   $ 248,720 $ 217,053  
Net income per share:        
Basic (in dollars per share)   $ 1.76 $ 1.50  
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted   $ 1.73 $ 1.48  
Weighted Average Basic Shares Outstanding, Pro Forma   137,810 140,944  
Weighted average number of shares outstanding:        
Pro Forma Weighted Average Shares Outstanding, Diluted   140,112 142,891