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Note New Accounting Pronouncement - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
Restricted Cash Money Market |  | $ 11,234 | $ 8,944 |  |  |
Cumulative effect of accounting change |  |  |  |  |  | $ 1,935
ASU 2016-01 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  | $ 600 |
Reclassification From Trading And Available For Sale Securities To Equity Securities |  |  |  |  | $ 11,000 |
ASU 2016-02 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification | $ 200,000 |  |  |  |  |
ASU 2016-15 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
Reclassification From Operating To Investing Activities |  |  | 500 |  |  |
ASU 2016-16 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  | $ 1,300 |  |
ASU 2017-07 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle Line Items |  |  |  |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses |  | $ 6,700 | $ 5,600 |  |  |

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