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Recently Adopted Accounting Standards and Recently Issued Accounting Pronouncements - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) Asset | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Investment impairment charges |  | $ (4,449) |  |  | $ (4,678) |  |
Prepaid income taxes |  |  |  | $ 8,600 |  |  |
Number of assets transferred | Asset |  |  |  | 2 |  |  |
Increase (decrease) in net cash from operating activities |  |  |  |  | 28,829 | $ 9,125 |
ASU 2016-01 and 2018-03 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impact on remeasurement of equity investments recorded within other current assets or long term assets |  |  | $ 1,600 |  |  |  |
Impact on remeasurement of equity investments per share before taxes recorded within other income (expense) | $ / shares |  |  | $ 0.09 |  |  |  |
Investment impairment charges |  | 4,400 |  |  |  |  |
ASU 2016-16, as Amended [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 1,900 |  |  |  |  |  |
ASU 2016-18 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in net cash from operating activities |  |  |  |  | $ 2,500 | $ (14,400) |
ASU 2017-01 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Assets Acquired Not Meeting The Definition of a Business |  | $ 700 | $ 1,900 |  |  |  |
ASU 2016-02 [Member] | Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating leases assets and liabilities expected to be recognized |  |  |  |  |  |  | $ 12,000

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