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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance | $ 1,115,539 | $ 975,526 | $ 1,144,923 | $ 1,021,944
Interest income and other, net | 1,579 | 2,709 | 5,908 | 5,495
Tax effect | 15,071 | 1,278 | 26,443 | 10,396
Total gains for the period, net of tax | (44,200) | (30,896) | (81,890) | (81,008)
Balance | 1,077,764 | 943,908 | 1,077,764 | 943,908
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance | 2,194 | (403) | 2,194 | (147)
Losses recognized in OCI |  |  |  | (660)
Net period OCI |  |  |  | (256)
Total gains for the period, net of tax |  | 0 |  | (256)
Balance | $ 2,194 | $ (403) | $ 2,194 | (403)
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net |  |  |  | $ 404

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