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BUSINESS ACQUISITIONS - Additional information (Details) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 segment | Jan. 10, 2019 USD ($) | Oct. 31, 2018 USD ($) segment payment | Jul. 23, 2018 USD ($) | Jun. 11, 2018 USD ($) payment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, financing |  |  |  |  |  |  |  |  | $ 4,755,000 | $ 21,275,000 | $ 27,588,000 |
Contingent consideration payment, total |  |  |  |  |  |  |  |  | 25,787,000 | 12,500,000 | 21,912,000 |
Goodwill |  |  |  |  |  | $ 420,139,000 | $ 420,139,000 |  | $ 420,139,000 | 420,139,000 | 348,347,000 |
Number of reportable segments | segment | 1 |  | 1 |  |  |  |  |  | 3 |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  | 600,000 | 6,900,000 |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  | $ 5,327,000 | 28,402,000 | 10,788,000 |
Contingent consideration arrangements, after tax contingent consideration expense |  |  |  |  |  |  |  |  |  | 21,500,000 | 7,200,000 |
Current contingent consideration |  |  |  |  |  | 0 | 9,028,000 |  | 0 | 9,028,000 |  |
SnapCap |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, financing |  |  |  |  |  |  |  |  | 3,300,000 | 3,000,000.0 |  |
Contingent consideration payment, total |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  |
Contingent consideration payment, operating |  |  |  |  |  |  |  |  | 2,700,000 |  |  |
Acquisition purchase consideration |  |  |  |  |  |  |  |  | 0 | 0 | 10,000 |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  | 77,000 | 2,220,000 | (330,000) |
DepositAccounts |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, financing |  |  |  |  |  |  |  |  |  |  | 4,000,000.0 |
Contingent consideration payment, total |  |  |  |  |  |  |  |  | 0 |  |  |
Contingent consideration payment, operating |  |  |  |  |  |  |  |  |  | 3,000,000.0 |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  | 0 | (947,000) | 1,979,000 |
ValuePenguin |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition purchase consideration |  | $ 106,100,000 |  |  |  |  |  |  |  |  |  |
Total purchase price |  | 106,232,000 |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  | 100,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 71,739,000 |  |  |  |  |  |  |  |  |  |
Revenue of acquirees since acquisition date |  |  |  |  |  |  |  |  |  | 19,800,000 |  |
Earnings of acquiree since acquisition date |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  | 100,000 |  |
QuoteWizard |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, financing |  |  |  |  |  |  | 13,900,000 |  |  |  |  |
Contingent consideration payment, total |  |  |  |  |  |  | 23,400,000 |  |  |  |  |
Contingent consideration payment, operating |  |  |  |  |  | 20,200,000 | 9,500,000 |  |  |  |  |
Acquisition purchase consideration |  |  | $ 299,900,000 |  |  |  |  |  |  |  |  |
Total purchase price |  |  | 313,355,000 |  |  |  |  |  |  |  |  |
Working capital adjustment |  |  | 400,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 182,896,000 |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | 4,800,000 | $ 5,900,000
Cash on hand |  |  | $ 174,900,000 |  |  |  |  |  |  |  |  |
Number of payments | payment |  |  | 3 |  |  |  |  |  |  |  |  |
Contingent consideration on acquisition date |  |  | $ 13,900,000 |  |  | 8,200,000 |  |  | 8,200,000 |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  | 3,980,000 | 27,103,000 | 6,833,000 |
Contingent consideration arrangements, after tax contingent consideration expense |  |  |  |  |  |  |  |  |  |  | 4,900,000 |
Student Loan Hero |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition purchase consideration |  |  |  | $ 60,700,000 |  |  |  |  |  |  |  |
Total purchase price |  |  |  | 60,418,000 |  |  |  |  |  |  |  |
Working capital adjustment |  |  |  | 2,000,000.0 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 40,856,000 |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | 500,000 |
Severance costs |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |
Ovation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, financing |  |  |  |  |  | 1,400,000 | $ 4,400,000 |  |  |  |  |
Contingent consideration payment, total |  |  |  |  |  | 4,400,000 |  |  |  |  |  |
Contingent consideration payment, operating |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |
Acquisition purchase consideration |  |  |  |  | $ 12,200,000 |  |  |  |  |  |  |
Total purchase price |  |  |  |  | 17,871,000 |  |  |  |  |  |  |
Working capital adjustment |  |  |  |  | 100,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 11,280,000 |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | 400,000 |
Number of payments | payment |  |  |  |  | 2 |  |  |  |  |  |  |
Contingent consideration on acquisition date |  |  |  |  | $ 5,800,000 |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  | $ 1,270,000 | $ 26,000 | $ 1,654,000 |
Earnout Payment | QuoteWizard |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, minimum |  |  | 0 |  |  |  |  |  |  |  |  |
Contingent consideration range, maximum |  |  | 23,400,000 |  |  |  |  |  |  |  |  |
Earnout Payment | Ovation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration range, minimum |  |  |  |  | 0 |  |  |  |  |  |  |
Contingent consideration range, maximum |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |
Revolving Credit Facility | ValuePenguin |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  | $ 90,000,000.0 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | QuoteWizard |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  | $ 125,000,000.0 |  |  |  |  |  |  |  |  |

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