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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Other Payable | $ 5,462,000 | $ 11,708,000 | $ 10,664,000
Payments to Acquire Businesses, Gross | 934,928,000 | 41,471,000 | 124,716,000
Recorded Earn-Out Payable | 77,377,000 | 6,921,000 | 4,462,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets | 11,054,000 |  | 2,094,000
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  | 601,000 | 5,079,000
Fixed assets | 5,829,000 | 69,000 | 684,000
Goodwill | 717,710,000 | 42,172,000 | 93,376,000
Purchased customer accounts | 342,008,000 | 18,738,000 | 50,625,000
Non-compete agreements | 3,222,000 | 721,000 | 228,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets | 18,588,000 |  | 20,000
Total assets acquired | 1,151,328,000 | 62,301,000 | 152,106,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 52,917,000 |  |
Other current liabilities | (32,996,000) | (1,512,000) | (8,542,000)
Deferred Tax Liabilities, Net |  | (689,000) | (3,230,000)
Other liabilities | (565,000) |  |
Total liabilities assumed | (33,561,000) | (2,201,000) | (11,772,000)
Net assets acquired | 1,117,767,000 | 60,100,000 | 140,334,000
Maximum Potential Earn- Out Payable | 147,668,000 | 27,451,000 | 16,285,000
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 |  | 0
Business Acquisition Purchase Price Allocation Current Assets Prepaid Expenses And Other Assets |  |  | 1,555,000
Fixed assets | 100,000 |  | 77,000
Goodwill | 22,712,000 |  | 19,570,000
Purchased customer accounts | 15,085,000 |  | 11,075,000
Non-compete agreements | 297,000 |  | 117,000
Business Acquisitions Purchase Price Allocation Other Noncurrent Assets | 754,000 |  | 20,000
Total assets acquired | 39,271,000 |  | 32,414,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 323,000 |  |
Other current liabilities | (1,715,000) |  | (5,410,000)
Deferred Tax Liabilities, Net |  |  | 0
Other liabilities | 0 |  |
Total liabilities assumed | (1,715,000) |  | (5,410,000)
Net assets acquired | 37,556,000 |  | 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
Other Acquisitions [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 717,700,000 |  |
Services |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 16,500,000 | 700,000 | 22,400,000
Services | Social Security Advocates for the Disabled LLC [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
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 | 676,900,000 | 33,100,000 | 13,100,000
National Programs |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | 18,700,000 | 7,200,000 | 57,900,000
Wholesale Brokerage |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Goodwill | $ 5,500,000 | $ 1,200,000 | (1,200)
Wholesale Brokerage | Morstan General Agency, Inc [Member] |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
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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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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