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New Accounting Pronouncements - Additional Information (Detail) - USD ($) | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating liabilities, expected to be recognized | $ 1,043,894,000 |  |
Retained earnings | $ (714,596,000) |  | $ (695,337,000)
ASU 2018-11 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating liabilities, expected to be recognized |  | $ 1,200,000,000 |
Retained earnings |  | $ 0 |

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