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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Beginning balance | $ 20,483 | $ 18,413 | $ 17,384
Reductions | 0 | 0 | 0
Reductions | 0 | (802) | 0
Settlements | 0 | 0 | 0
Lapses in statute of limitations | 0 | 0 | 0
Ending balance | 27,419 | 20,483 | 18,413
Federal [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 2,019 | 1,206 | 530
Tax positions related to prior year, Additions | 669 | 0 | 0
State [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 3,645 | 1,666 | 499
Tax positions related to prior year, Additions | 603 | 0 | 0
Foreign [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to prior year, Additions | $ 0 | $ 0 | $ 0

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