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Stock Compensation Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting terms | vesting terms ranging from three to five years which primarily includes 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date. |  |
Period of graded vesting for option valuation | 4 years |  |
Period of cliff vesting for option valuation | 5 years |  |
Expected dividend yield | 5.00% | 5.00% | 5.00%
Total unrecognized compensation cost related to nonvested awards | $ 2,544 |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year 7 months 13 days |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 2,435,451 |  |
Aggregate intrinsic value of options outstanding | $ 13,824 |  |
Aggregate intrinsic value of options exercisable | 11,927 |  |
Total intrinsic value of options exercised | 1,644 |  |
Accrued expenses, liability | $ 11,589 | $ 23,297 |
Common Class A [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expected Volatility | 90.00% |  |
Volatility rate on publicly traded options | 10.00% |  |
Minimum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Maximum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
1996 Equity Incentive Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares reserved for issuance to directors and employees | 17,500,000 |  |
1996 Equity Incentive Plan [Member] | Minimum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Range of awards of target number of share | 0.00% |  |
1996 Equity Incentive Plan [Member] | Maximum [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Range of awards of target number of share | 100.00% |  |
2019 Employee Stock Purchase Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Additional shares reserved | 86,093 |  |
Performance Based Compensation [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense related to performance based compensation agreements | $ 10,484 |  |
Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expiration date of options granted under equity incentive plan | 10 years |  |

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