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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 02, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |
Business combination, final purchase price |  | $ 28,100,000
Loss contingency accrual |  | 500,000
Subsequent Event [Member] |  |
Loss Contingencies [Line Items] |  |
Business combination, final purchase price | $ 28,700,000 |
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Business combination, final purchase price |  | 27,900,000
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Business combination, final purchase price |  | $ 29,900,000

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