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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 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 | 42,697,000 | $ 36,200,000
Recorded Earn-Out Payable | 606,000 |
Other current assets | 1,379,000 |
Fixed assets | 349,000 |
Goodwill | 28,952,000 |
Purchased customer accounts | 16,779,000 |
Non-compete agreements | 134,000 |
Total assets acquired | 49,687,000 |
Other current liabilities | (2,362,000) |
Deferred Tax Liabilities, Net | (3,230,000) |
Total liabilities assumed | (5,592,000) |
Net assets acquired | 44,095,000 |
Maximum Potential Earn- Out Payable | 5,474,000 |
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 | 22,294,000 |
Purchased customer accounts | 13,069,000 |
Non-compete agreements | 72,000 |
Total assets acquired | 38,878,000 |
Other current liabilities | (1,686,000) |
Deferred Tax Liabilities, Net | (3,230,000) |
Total liabilities assumed | (4,916,000) |
Net assets acquired | 33,962,000 |
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 | 337,000 |
Fixed assets | 42,000 |
Goodwill | 6,658,000 |
Purchased customer accounts | 3,710,000 |
Non-compete agreements | 62,000 |
Total assets acquired | 10,809,000 |
Other current liabilities | (676,000) |
Deferred Tax Liabilities, Net | 0 |
Total liabilities assumed | (676,000) |
Net assets acquired | 10,133,000 |
Wholesale Brokerage |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Goodwill | $ 24,000 |

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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 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=73530397&loc=d3e4845-128472 + 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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