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Revenue Recognition Revenue Recognition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 15,090 |  | $ 15,090 |  | $ 52,924
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Contract with Customer, Performance Obligation Satisfied in Previous Period | $ (4,138) | $ 1,246 | $ 35,658 | $ 77,473 |
Contract With Customer Performance Obligation Not Substantially Completed |  |  |  | $ 36,000 |

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