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Business Combinations - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2015 USD ($) acquisition customer_account | Dec. 31, 2014 USD ($) acquisition | Dec. 31, 2013 USD ($) acquisition | Dec. 31, 2012 USD ($)
Business Acquisition [Line Items] |  |  |  |
Maximum Future Contingency payments Acquisitions | $ 137,400,000 |  |  |
Number of acquisitions | acquisition | 13 | 10 |  |
Aggregate purchase price of acquisitions | $ 503,442 | $ 25,941 | $ 504,300 |
Payments to Acquire Businesses, Gross | 136,000,000 | 721,851,000 | 408,072,000 |
Goodwill assigned | 136,381,000 | 513,925,000 | 295,944,000 |
Goodwill currently deductible for income tax purposes | 91,100,000 | 141,900,000 | 41,600,000 |
Goodwill currently non-deductible for income tax purposes | 8,400,000 | 338,800,000 | 249,200,000 |
Goodwill related to the recorded earn-out payables | 36,900,000 | 33,200,000 | 5,100,000 |
Total revenues related to acquisitions | 28,200,000 | 112,200,000 | 63,800,000 |
Income before income taxes related to acquisitions | 1,500,000 | (1,300,000) | 900,000 |
Estimated acquisition earn-out payables | 78,387,000 | 75,283,000 | 43,058,000 | $ 52,987,000
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 25,300,000 | $ 26,000,000 | $ 6,300,000 |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years | 15 years | 15 years |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years | 3 years 5 months | 5 years |
Retail |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | $ 113,800,000 | $ 86,400,000 | $ 257,200,000 |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 18,000,000 | 420,000,000 | 27,100,000 |
Wholesale Brokerage [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 4,600,000 | 7,700,000 | (800,000) |
Services [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned |  | (200,000) | 12,400,000 |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 53,100,000 | $ 49,300,000 | $ 36,800,000 |
Asset Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 13 | 9 | 8 |
Book of Business Purchases [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | 4 | 5 | 1 |
Stock Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | acquisition | 0 | 1 | 1 |

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