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Redeemable Preferred Stocks - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |  |
Fair value of the embedded derivative | $ 1,118 | $ 1,118 |  | $ 1,642
Non-Operating Other Income [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Unrealized gain on change in fair value of the embedded derivative | 700 | 500 | $ 1,100 |
Other Noncurrent Accrued and Other Liabilities [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Fair value of the embedded derivative | $ 1,100 | $ 1,100 |  | $ 1,600
Embedded Derivative [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Participating right in dividends and liquidating distributions expressed in number of common shares |  | 303,646 |  | 303,646
Embedded Derivative [Member] | Common Stock Shares [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock per share | $ 3.90 | $ 3.90 |  | $ 5.52
Series E Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock cumulative dividend rate |  | 14.00% |  |
Participating right in dividends and liquidating distributions expressed in number of common shares |  | 303,646 |  |
Series E Redeemable Preferred Stock [Member] | April 2021 |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Increase in preferred stock cumulative dividend rate |  | 0.50% |  |
Series E Redeemable Preferred Stock [Member] | April 2022 |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Increase in preferred stock cumulative dividend rate |  | 0.50% |  |
Series E Redeemable Preferred Stock [Member] | April 2023 |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Increase in preferred stock cumulative dividend rate |  | 1.00% |  |
Series F Redeemable Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock voting rights shares | 456,225 | 456,225 |  |

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