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Business Combinations - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions $ 17,865,000 $ 1,140,408,000 $ 17,865,000        
Cash payment for acquisition   720,102,000 14,366,000        
Other payables for acquisition 85,000 125,000 85,000        
Assumption of liabilities   407,023,000 860,000        
Recorded earn-out payables   13,158,000 2,554,000        
Average annual operating profit earned period, minimum (years)   1 year 1 year        
Average annual operating profit earned period, maximum (years)   3 years 3 years        
Aggregate purchase price of acquisitions   33,000          
Total goodwill 10,687,000 503,107,000 10,687,000        
Goodwill assigned 10,687,000 503,107,000 10,687,000        
Goodwill currently deductible for income tax purposes 9,308,000 148,592,000 9,308,000        
Goodwill currently non-deductible for income tax purposes (454,000) 341,357,000 (454,000)        
Goodwill related to the recorded earn-out payables 1,833,000 13,158,000 1,833,000        
Total revenues related to acquisitions 627,000 29,796,000 627,000        
Income before income taxes related to acquisitions 142,000 1,294,000 142,000        
Recorded earn-out payable   13,158,000 1,833,000        
Maximum future contingency payments related to acquisitions   153,019,000          
Percentage recognition by acquirer of fair value of acquired assets   100.00%          
Future earnings of acquired entities, term basis of potential earn-out obligations, minimum (years)   1 year          
Future earnings of acquired entities, term basis of potential earn-out obligations, maximum (years)   3 years          
Estimated acquisition earn-out payables 48,918,000 52,696,000 48,918,000 48,806,000 43,058,000 49,469,000 52,987,000
Scenario, Adjustment [Member]
              
Business Acquisition [Line Items]              
Aggregate purchase price of acquisitions 1,115,000   1,115,000        
Cash payment for acquisition     18,000        
Other payables for acquisition 454,000   454,000        
Assumption of liabilities     42,000        
Recorded earn-out payable     721,000        
Accounts Payable [Member]
              
Business Acquisition [Line Items]              
Estimated acquisition earn-out payables   20,278,000          
Purchased customer accounts [Member]
              
Business Acquisition [Line Items]              
Weighted average life (years)   15 years 15 years        
Non-compete agreements [Member]
              
Business Acquisition [Line Items]              
Weighted average life (years)   3 years 3 months 18 days 5 years        
Retail [Member]
              
Business Acquisition [Line Items]              
Goodwill assigned 11,984,000 78,395,000 11,984,000        
National Programs [Member]
              
Business Acquisition [Line Items]              
Goodwill assigned (454,000) 417,539,000 (454,000)        
Services [Member]
              
Business Acquisition [Line Items]              
Goodwill assigned   (239,000)          
Wholesale Brokerage [Member]
              
Business Acquisition [Line Items]              
Goodwill assigned (843,000) 7,412,000 (843,000)        
Asset Acquisitions [Member]
              
Business Acquisition [Line Items]              
Number of acquisitions   5 2        
Stock Acquisitions [Member]
              
Business Acquisition [Line Items]              
Number of acquisitions   1          
Other Non-Current Liability [Member]
              
Business Acquisition [Line Items]              
Estimated acquisition earn-out payables   $ 32,418,000