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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($) | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | $ 2,094,000 |
Payments to Acquire Businesses, Gross | 109,384,000 | $ 105,100,000
Recorded Earn-Out Payable | 2,393,000 |
Other current assets | 4,277,000 |
Fixed assets | 649,000 |
Goodwill | 78,664,000 |
Purchased customer accounts | 44,135,000 |
Non-compete agreements | 184,000 |
Total assets acquired | 130,003,000 |
Other current liabilities | (4,004,000) |
Deferred Tax Liabilities, Net | (3,230,000) |
Total liabilities assumed | (7,234,000) |
Net assets acquired | 122,769,000 |
Maximum Potential Earn- Out Payable | 11,864,000 |
SSAD [Member] |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | 2,094,000 |
Other current assets | 1,042,000 |
Fixed assets | 307,000 |
Goodwill | 22,321,000 |
Purchased customer accounts | 13,069,000 |
Non-compete agreements | 72,000 |
Total assets acquired | 38,905,000 |
Other current liabilities | (1,686,000) |
Deferred Tax Liabilities, Net | (3,230,000) |
Total liabilities assumed | (4,916,000) |
Net assets acquired | 33,989,000 |
Morstan General Agency, Inc. [Member] |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Other current assets | 2,482,000 |
Fixed assets | 300,000 |
Goodwill | 49,954,000 |
Purchased customer accounts | 26,775,000 |
Non-compete agreements | 39,000 |
Total assets acquired | 79,550,000 |
Other current liabilities | (1,415,000) |
Deferred Tax Liabilities, Net | 0 |
Total liabilities assumed | (1,415,000) |
Net assets acquired | 78,135,000 |
Other Acquisitions [Member] |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents | 0 |
Other current assets | 753,000 |
Fixed assets | 42,000 |
Goodwill | 6,389,000 |
Purchased customer accounts | 4,291,000 |
Non-compete agreements | 73,000 |
Total assets acquired | 11,548,000 |
Other current liabilities | (903,000) |
Deferred Tax Liabilities, Net | 0 |
Total liabilities assumed | (903,000) |
Net assets acquired | 10,645,000 |
Wholesale Brokerage |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Goodwill | $ 49,978,000 |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed 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=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed 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=73530397&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: 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=73530397&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of 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=73530397&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 + Details
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