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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 25,365,000 | $ 40,360,000
Payments to Acquire Businesses, Gross | $ 136,000,000 | 721,851,000 | 408,072,000
Other Payable | 10,028,000 | 1,904,000 | 552,000
Recorded Earn-Out Payable | 36,899,000 | 33,229,000 | 5,091,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets | 3,640,000 | 20,964,000 | 59,598,000
Fixed assets | 374,000 | 8,973,000 | 1,915,000
Goodwill | 136,381,000 | 513,925,000 | 295,944,000
Purchased customer accounts | 53,392,000 | 260,424,000 | 118,983,000
Non-compete agreements | 328,000 | 1,194,000 | 2,886,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets | 14,000 | 20,045,000 | 108,000
Total assets acquired | 194,129,000 | 1,165,141,000 | 519,794,000
Other current liabilities | (12,213,000) | (14,974,000) | (81,150,000)
Deferred Tax Liabilities, Net | 2,576,000 | (46,566,000) | (22,764,000)
Other liabilities | (1,565,000) | (32,366,000) | (2,165,000)
Total liabilities assumed | (11,202,000) | (408,157,000) | (106,079,000)
Net assets acquired | 182,927,000 | 756,984,000 | 413,715,000
Maximum Potential Earn- Out Payable | 73,074,000 | 49,462,000 | 16,768,000
Business Acquisitions Purchase Price Allocation Losses And Loss Adjustment Expense |  | (25,238,000) |
Business Acquisition Purchase Price Allocation Unearned Premium |  | (289,013,000) |
Business Acquisition Purchase Price Allocation Reinsurance Recoverables |  | 25,238,000 |
Business Acquisition Purchase Price Allocation Prepaid Reinsurance Premiums |  | 289,013,000 |
Liberty Insurance Brokers, Inc. and Affiliates (Liberty) |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 393,000
Fixed assets |  |  | 30,000
Goodwill |  |  | 12,697,000
Purchased customer accounts |  |  | 3,878,000
Non-compete agreements |  |  | 31,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 17,029,000
Other current liabilities |  |  | (866,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | (866,000)
Net assets acquired |  |  | 16,163,000
Beecher Carlson Holdings [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 40,360,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 57,632,000
Fixed assets |  |  | 1,786,000
Goodwill |  |  | 265,174,000
Purchased customer accounts |  |  | 101,565,000
Non-compete agreements |  |  | 2,758,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 0
Total assets acquired |  |  | 469,275,000
Other current liabilities |  |  | (80,090,000)
Deferred Tax Liabilities, Net |  |  | (22,764,000)
Other liabilities |  |  | (2,165,000)
Total liabilities assumed |  |  | (105,019,000)
Net assets acquired |  |  | 364,256,000
ICA, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 0
Fixed assets |  |  | 75,000
Goodwill |  |  | 12,377,000
Purchased customer accounts |  |  | 7,917,000
Non-compete agreements |  |  | 21,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  |  | 107,000
Total assets acquired |  |  | 20,497,000
Other current liabilities |  |  | 0
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities |  |  | 0
Total liabilities assumed |  |  | 0
Net assets acquired |  |  | 20,497,000
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 Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 0 | 0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets | 169,000 | 742,000 | 1,573,000
Fixed assets | 59,000 | 1,724,000 | 24,000
Goodwill | 21,040,000 | 10,417,000 | 5,696,000
Purchased customer accounts | (2,135,000) | 4,384,000 | 5,623,000
Non-compete agreements | 156,000 | 166,000 | 76,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets | 0 | 0 | 1,000
Total assets acquired | 19,289,000 | 17,433,000 | 12,993,000
Other current liabilities | (4,895,000) | (249,000) | (194,000)
Deferred Tax Liabilities, Net | 2,576,000 | 0 | 0
Other liabilities | 635,000 | 0 | 0
Total liabilities assumed | (1,684,000) | (249,000) | (194,000)
Net assets acquired | 17,605,000 | 17,184,000 | 12,799,000
Business Acquisitions Purchase Price Allocation Losses And Loss Adjustment Expense |  | 0 |
Business Acquisition Purchase Price Allocation Unearned Premium |  | 0 |
Business Acquisition Purchase Price Allocation Reinsurance Recoverables |  | 0 |
Business Acquisition Purchase Price Allocation Prepaid Reinsurance Premiums |  | 0 |
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 |  |
Wright Insurance Group Llc [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 25,365,000 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 16,474,000 |
Fixed assets |  | 7,172,000 |
Goodwill |  | 420,209,000 |
Purchased customer accounts |  | 213,677,000 |
Non-compete agreements |  | 966,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 20,045,000 |
Total assets acquired |  | 1,018,159,000 |
Other current liabilities |  | (14,322,000) |
Deferred Tax Liabilities, Net |  | (46,566,000) |
Other liabilities |  | (32,366,000) |
Total liabilities assumed |  | (407,505,000) |
Net assets acquired |  | 610,654,000 |
Business Acquisitions Purchase Price Allocation Losses And Loss Adjustment Expense |  | (25,238,000) |
Business Acquisition Purchase Price Allocation Unearned Premium |  | (289,013,000) |
Business Acquisition Purchase Price Allocation Reinsurance Recoverables |  | 25,238,000 |
Business Acquisition Purchase Price Allocation Prepaid Reinsurance Premiums |  | 289,013,000 |
Pacific Resources Benefits Advisors [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 0 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 3,647,000 |
Fixed assets |  | 53,000 |
Goodwill |  | 76,023,000 |
Purchased customer accounts |  | 38,111,000 |
Non-compete agreements |  | 21,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 0 |
Total assets acquired |  | 117,855,000 |
Other current liabilities |  | (403,000) |
Deferred Tax Liabilities, Net |  | 0 |
Other liabilities |  | 0 |
Total liabilities assumed |  | (403,000) |
Net assets acquired |  | 117,452,000 |
Business Acquisitions Purchase Price Allocation Losses And Loss Adjustment Expense |  | 0 |
Business Acquisition Purchase Price Allocation Unearned Premium |  | 0 |
Business Acquisition Purchase Price Allocation Reinsurance Recoverables |  | 0 |
Business Acquisition Purchase Price Allocation Prepaid Reinsurance Premiums |  | 0 |
Axia Strategies, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 0 |
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 101,000 |
Fixed assets |  | 24,000 |
Goodwill |  | 7,276,000 |
Purchased customer accounts |  | 4,252,000 |
Non-compete agreements |  | 41,000 |
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets |  | 0 |
Total assets acquired |  | 11,694,000 |
Other current liabilities |  | 0 |
Deferred Tax Liabilities, Net |  | 0 |
Other liabilities |  | 0 |
Total liabilities assumed |  | 0 |
Net assets acquired |  | 11,694,000 |
Business Acquisitions Purchase Price Allocation Losses And Loss Adjustment Expense |  | 0 |
Business Acquisition Purchase Price Allocation Unearned Premium |  | 0 |
Business Acquisition Purchase Price Allocation Reinsurance Recoverables |  | 0 |
Business Acquisition Purchase Price Allocation Prepaid Reinsurance Premiums |  | 0 |
Retail |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | $ 113,800,000 | $ 86,400,000 | $ 257,200,000
Retail | Liberty Insurance Brokers, Inc. and Affiliates (Liberty) |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jun. 01, 2013
Payments to Acquire Businesses, Gross |  |  | $ 13,792,000
Other Payable |  |  | 50,000
Recorded Earn-Out Payable |  |  | 2,321,000
Net assets acquired |  |  | 16,163,000
Maximum Potential Earn- Out Payable |  |  | 4,300,000
Retail | Spain Agency, Inc. (Spain) |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition | Mar. 01, 2015 |  |
Payments to Acquire Businesses, Gross | $ 20,706,000 |  |
Other Payable | 0 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 9,455,000 |  |
Other Payable | 0 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 49,600,000 |  |
Other Payable | 400,000 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 10,142,000 |  |
Other Payable | 391,000 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 68,000 |  |
Other Payable | 8,442,000 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 12,096,000 |  |
Other Payable | 200,000 |  |
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 |  |
Payments to Acquire Businesses, Gross | $ 12,000,000 |  |
Other Payable | 0 |  |
Recorded Earn-Out Payable | 2,981,000 |  |
Net assets acquired | 14,981,000 |  |
Maximum Potential Earn- Out Payable | 3,750,000 |  |
Retail | Pacific Resources Benefits Advisors [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Payments to Acquire Businesses, Gross |  | $ 90,000,000 |
Other Payable |  | 0 |
Recorded Earn-Out Payable |  | 27,452,000 |
Net assets acquired |  | 117,452,000 |
Maximum Potential Earn- Out Payable |  | 35,000,000 |
National Programs |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | $ 18,000,000 | $ 420,000,000 | 27,100,000
National Programs | Bellingham Underwriters, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition | May 01, 2015 |  |
National Programs | Wright Insurance Group Llc [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Payments to Acquire Businesses, Gross |  | $ 609,183,000 |
Other Payable |  | 1,471,000 |
Recorded Earn-Out Payable |  | 0 |
Net assets acquired |  | 610,654,000 |
Maximum Potential Earn- Out Payable |  | 0 |
Wholesale Brokerage |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | $ 4,600,000 | $ 7,700,000 | $ (800,000)
Wholesale Brokerage | Axia Strategies, Inc. [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Payments to Acquire Businesses, Gross |  | $ 9,870,000 |
Other Payable |  | 0 |
Recorded Earn-Out Payable |  | 1,824,000 |
Net assets acquired |  | 11,694,000 |
Maximum Potential Earn- Out Payable |  | $ 5,200,000 |

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