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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Other Payable | $ 11,708,000 | $ 10,664,000 | $ 10,028,000
Payments to Acquire Businesses, Gross | 41,471,000 | 124,716,000 | 136,000,000.0
Recorded Earn-Out Payable | 6,921,000 | 4,462,000 | 36,899,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 2,094,000 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets | 601,000 | 5,079,000 | 3,640,000
Fixed assets | 69,000 | 684,000 | 374,000
Goodwill | 42,172,000 | 93,376,000 | 136,381,000
Purchased customer accounts | 18,738,000 | 50,625,000 | 53,392,000
Non-compete agreements | 721,000 | 228,000 | 328,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 20,000 | 14,000
Total assets acquired | 62,301,000 | 152,106,000 | 194,129,000
Other current liabilities | (1,512,000) | (8,542,000) | (12,213,000)
Deferred Tax Liabilities, Net | (689,000) | (3,230,000) |
Deferred Tax Assets, Net |  |  | 2,576,000
Other liabilities |  |  | (1,565,000)
Total liabilities assumed | (2,201,000) | (11,772,000) | (11,202,000)
Net assets acquired | 60,100,000 | 140,334,000 | 182,927,000
Maximum Potential Earn- Out Payable | 27,451,000 | 16,285,000 | 73,074,000
Social Security Advocates for the Disabled LLC [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 2,094,000 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 1,042,000 |
Fixed assets |  | 307,000 |
Goodwill |  | 22,352,000 |
Purchased customer accounts |  | 13,069,000 |
Non-compete agreements |  | 72,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 0 |
Total assets acquired |  | 38,936,000 |
Other current liabilities |  | (1,717,000) |
Deferred Tax Liabilities, Net |  | (3,230,000) |
Total liabilities assumed |  | (4,947,000) |
Net assets acquired |  | 33,989,000 |
Various [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 0 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 1,555,000 |
Fixed assets |  | 77,000 |
Goodwill |  | 19,570,000 |
Purchased customer accounts |  | 11,075,000 |
Non-compete agreements |  | 117,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 20,000 |
Total assets acquired |  | 32,414,000 |
Other current liabilities |  | (5,410,000) |
Deferred Tax Liabilities, Net |  | 0 |
Total liabilities assumed |  | (5,410,000) |
Net assets acquired |  | 27,004,000 |
Morstan General Agency, Inc [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 0 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 2,482,000 |
Fixed assets |  | 300,000 |
Goodwill |  | 51,454,000 |
Purchased customer accounts |  | 26,481,000 |
Non-compete agreements |  | 39,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 0 |
Total assets acquired |  | 80,756,000 |
Other current liabilities |  | (1,415,000) |
Deferred Tax Liabilities, Net |  | 0 |
Total liabilities assumed |  | (1,415,000) |
Net assets acquired |  | 79,341,000 |
Spain Agency, Inc. (Spain) |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 324,000
Fixed assets |  |  | 50,000
Goodwill |  |  | 15,748,000
Purchased customer accounts |  |  | 7,430,000
Non-compete agreements |  |  | 21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 23,573,000
Other current liabilities |  |  | (250,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (250,000)
Net assets acquired |  |  | 23,323,000
Bellingham Underwriters, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 0
Fixed assets |  |  | 25,000
Goodwill |  |  | 9,608,000
Purchased customer accounts |  |  | 3,223,000
Non-compete agreements |  |  | 21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 12,877,000
Other current liabilities |  |  | (48,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (48,000)
Net assets acquired |  |  | 12,829,000
Fitness Insurance, LLC [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 9,000
Fixed assets |  |  | 17,000
Goodwill |  |  | 8,105,000
Purchased customer accounts |  |  | 3,715,000
Non-compete agreements |  |  | 0
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 11,846,000
Other current liabilities |  |  | (12,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (12,000)
Net assets acquired |  |  | 11,834,000
Other |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 652,000
Fixed assets |  |  | 41,000
Goodwill |  |  | 39,859,000
Purchased customer accounts |  |  | 23,000,000
Non-compete agreements |  |  | 21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 14,000
Total assets acquired |  |  | 63,587,000
Other current liabilities |  |  | 0
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | 0
Net assets acquired |  |  | 63,587,000
Bentrust Financial, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 0
Fixed assets |  |  | 36,000
Goodwill |  |  | 8,166,000
Purchased customer accounts |  |  | 2,789,000
Non-compete agreements |  |  | 43,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 11,034,000
Other current liabilities |  |  | (182,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (182,000)
Net assets acquired |  |  | 10,852,000
MBA Insurance Agency of Arizona, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 0
Fixed assets |  |  | 33,000
Goodwill |  |  | 13,471,000
Purchased customer accounts |  |  | 7,338,000
Non-compete agreements |  |  | 11,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 20,853,000
Other current liabilities |  |  | (6,280,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (6,280,000)
Net assets acquired |  |  | 14,573,000
Smith Insurance, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 0
Fixed assets |  |  | 73,000
Goodwill |  |  | 10,374,000
Purchased customer accounts |  |  | 3,526,000
Non-compete agreements |  |  | 31,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 14,004,000
Other current liabilities |  |  | (504,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | (157,000)
Total liabilities assumed |  |  | (661,000)
Net assets acquired |  |  | 13,343,000
Other Acquisitions [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 169,000
Fixed assets |  |  | 59,000
Goodwill |  |  | 21,040,000
Purchased customer accounts |  |  | (2,135,000)
Non-compete agreements |  |  | 156,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 19,289,000
Other current liabilities |  |  | (4,895,000)
Deferred Tax Assets, Net |  |  | 2,576,000
Other liabilities |  |  | 635,000
Total liabilities assumed |  |  | (1,684,000)
Net assets acquired |  |  | 17,605,000
Liberty Insurance Brokers, Inc. and Affiliates [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 2,486,000
Fixed assets |  |  | 40,000
Goodwill |  |  | 10,010,000
Purchased customer accounts |  |  | 4,506,000
Non-compete agreements |  |  | 24,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 17,066,000
Other current liabilities |  |  | (42,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | (2,043,000)
Total liabilities assumed |  |  | (2,085,000)
Net assets acquired |  |  | 14,981,000
Services |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 700,000 | $ 22,400,000 |
Services | Social Security Advocates for the Disabled LLC [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  | Feb. 01, 2016 |
Other Payable |  | $ 0 |
Payments to Acquire Businesses, Gross |  | 32,526,000 |
Recorded Earn-Out Payable |  | 971,000 |
Net assets acquired |  | 33,989,000 |
Maximum Potential Earn- Out Payable |  | 3,500,000 |
Retail |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 33,100,000 | 13,100,000 | $ 113,800,000
Retail | Spain Agency, Inc. (Spain) |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Mar. 01, 2015
Other Payable |  |  | $ 0
Payments to Acquire Businesses, Gross |  |  | 20,706,000
Recorded Earn-Out Payable |  |  | 2,617,000
Net assets acquired |  |  | 23,323,000
Maximum Potential Earn- Out Payable |  |  | $ 9,162,000
Retail | Fitness Insurance, LLC [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jun. 01, 2015
Other Payable |  |  | $ 0
Payments to Acquire Businesses, Gross |  |  | 9,455,000
Recorded Earn-Out Payable |  |  | 2,379,000
Net assets acquired |  |  | 11,834,000
Maximum Potential Earn- Out Payable |  |  | $ 3,500,000
Retail | Other |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jun. 01, 2015
Other Payable |  |  | $ 400,000
Payments to Acquire Businesses, Gross |  |  | 49,600,000
Recorded Earn-Out Payable |  |  | 13,587,000
Net assets acquired |  |  | 63,587,000
Maximum Potential Earn- Out Payable |  |  | $ 26,000,000
Retail | Bentrust Financial, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 01, 2015
Other Payable |  |  | $ 391,000
Payments to Acquire Businesses, Gross |  |  | 10,142,000
Recorded Earn-Out Payable |  |  | 319,000
Net assets acquired |  |  | 10,852,000
Maximum Potential Earn- Out Payable |  |  | $ 2,200,000
Retail | MBA Insurance Agency of Arizona, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 01, 2015
Other Payable |  |  | $ 8,442,000
Payments to Acquire Businesses, Gross |  |  | 68,000
Recorded Earn-Out Payable |  |  | 6,063,000
Net assets acquired |  |  | 14,573,000
Maximum Potential Earn- Out Payable |  |  | $ 9,500,000
Retail | Smith Insurance, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 01, 2015
Other Payable |  |  | $ 200,000
Payments to Acquire Businesses, Gross |  |  | 12,096,000
Recorded Earn-Out Payable |  |  | 1,047,000
Net assets acquired |  |  | 13,343,000
Maximum Potential Earn- Out Payable |  |  | $ 6,350,000
Retail | Liberty Insurance Brokers, Inc. and Affiliates [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Feb. 01, 2015
Other Payable |  |  | $ 0
Payments to Acquire Businesses, Gross |  |  | 12,000,000
Recorded Earn-Out Payable |  |  | 2,981,000
Net assets acquired |  |  | 14,981,000
Maximum Potential Earn- Out Payable |  |  | 3,750,000
National Programs |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 7,200,000 | 57,900,000 | $ 18,000,000.0
National Programs | Bellingham Underwriters, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | May 01, 2015
Wholesale Brokerage |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | $ 1,200,000 | $ (1,200) | $ 4,600,000
Wholesale Brokerage | Morstan General Agency, Inc [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  | Jun. 01, 2016 |
Other Payable |  | $ 10,200,000 |
Payments to Acquire Businesses, Gross |  | 66,050,000 |
Recorded Earn-Out Payable |  | 3,091,000 |
Net assets acquired |  | 79,341,000 |
Maximum Potential Earn- Out Payable |  | $ 5,000,000 |

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