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Redeemable Preferred Stocks - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |  |
Fair value of the embedded derivative | $ 1,521 |  | $ 1,521 | $ 1,642
Non-Operating Other Income [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Unrealized loss on change in fair value of the embedded derivative | 400 | $ 1,100 |  |
Other Noncurrent Accrued and Other Liabilities [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Fair value of the embedded derivative | $ 1,500 |  | $ 1,500 | $ 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 | $ 5.18 |  | $ 5.18 | $ 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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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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