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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance | $ 1,127,685 | $ 985,481 | $ 1,144,923 | $ 1,021,944
Interest income and other, net | 1,859 | 2,914 | 4,329 | 2,786
Tax effect | 5,542 | 5,797 | 11,372 | 9,118
Total gains for the period, net of tax | (15,959) | (10,940) | (37,690) | (50,112)
Balance | 1,115,539 | 975,526 | 1,115,539 | 975,526
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Balance | 2,194 | (446) | 2,194 | (147)
Losses recognized in OCI |  |  |  | (660)
Net period OCI |  | 43 |  | (256)
Total gains for the period, net of tax |  | 43 |  | (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 |  | $ 43 |  | $ 404

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