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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract] |
Summary of Allowance for Deferred Income Tax Valuation Allowance |
| Balance at Beginning of Period |  |  | Increase |  |  | Decrease |  |  | Balance at End of Period |
Deferred income tax valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2017 | $ | 18,109 |  |  | $ | — |  |  | $ | (11,126 | ) |  | $ | 6,983 |
Year Ended December 28, 2016 |  | 25,593 |  |  |  | — |  |  |  | (7,484 | ) |  |  | 18,109 |
Year Ended December 29, 2015 |  | 44,700 |  |  |  | — |  |  |  | (19,107 | ) |  |  | 25,593 |

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- Definition Tabular disclosure of the allowance for deferred income taxes. + References No definition available. + Details
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- References No definition available. + Details
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