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Leases - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Jan. 01, 2019
Other Assets, Noncurrent | $ 10,157 | $ 10,374 |
Other Assets, Current | 35,760 | 32,473 |
Other Liabilities, Current | 29,366 | 28,680 |
Finance Lease, Right-of-Use Asset |  | $ 9,217 |
Accounting Standards Update 2016-02 [Member] |  |  |
Other Assets, Noncurrent |  |  | $ 44,900
Other Assets, Current |  |  | 1,400
Other Liabilities, Current |  |  | 1,000
Operating Lease, Liability |  |  | 44,500
Finance Lease, Right-of-Use Asset | 9,500 |  | $ 58,700
Accounting Standards Update 2016-02 [Member] | Cost of Sales [Member] |  |  |
Finance Lease, Right-of-Use Asset, Amortization | $ 32,000 |  |

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