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Business Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 18, 2018 | Oct. 03, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |
Goodwill | $ 69,658 |  |  | $ 51,613 | $ 49,777
E D I Admin [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |
Current assets |  |  | $ 631 |  |
Goodwill |  |  | 4,871 |  |
Intangible assets |  |  | 3,400 |  |
Current liabilities |  |  | (57) |  |
Deferred revenue |  |  | (110) |  |
Total purchase price |  |  | $ 8,735 |  |
CovalentWorks [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |
Current assets |  | $ 244 |  |  |
Property and equipment |  | 44 |  |  |
Goodwill |  | 15,402 |  |  |
Intangible assets |  | 7,210 |  |  |
Current liabilities |  | (56) |  |  |
Deferred revenue |  | (42) |  |  |
Total purchase price |  | $ 22,802 |  |  |

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- Definition Amount of 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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