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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