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Income Taxes (Narrative) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards | $ 25,600 |  |
Income tax expense (benefit), intraperiod tax allocation | $ 31,420 | $ 14,522 | $ 14,802
Effective tax rate, Statutory federal tax | 21.00% | 21.00% | 21.00%
Income tax expense | $ 31,406 | $ 14,447 | $ 14,759
Effective tax rate, Share-based compensation | (0.30%) | (7.00%) | (2.60%)
Maryland State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Operating loss carryforwards expiration year | 2029 |  |

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