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Stockholders' Equity - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Aug. 05, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost | $ 3,283,000 | $ 12,526,000 |
Amount share repurchase program of common shares |  |  | $ 25,000,000
Retiring President and Chief Executive Officer and Chief Financial Officer [Member] | General and Administrative Expenses [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost |  | 8,039,000 |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost | 894,000 | 1,734,000 |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost | $ 2,385,000 | $ 5,634,000 |
Vesting of restricted shares, withholding and exercise obligations | 289,000 | 164,000 |
Restricted shares of common stock, aggregate values | $ 3,711,000 | $ 3,181,000 |
Performance Based Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Performance Based Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Performance Based Restricted Stock Unit [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost | $ 4,000 | $ 5,158,000 |
Share Repurchase Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares purchased and retired | 0 | 0 |

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