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Commitments and Contingencies - Additional Information (Detail) |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 USD ($) | Dec. 09, 2016 USD ($) | Nov. 08, 2016 USD ($) | Jul. 15, 2017 USD ($) Lawsuits | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Self-insurance reserves, current liabilities |  |  |  | $ 37,100,000 | $ 28,000,000
Alleged complaints | Lawsuits |  |  |  | 30 |
Class and / or Collective action treatment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Alleged complaints | Lawsuits |  |  |  | 21 |
Individual claims and do not seek class or collective action treatment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Alleged complaints | Lawsuits |  |  |  | 13 |
North Carolina Class Action |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Legal settlement |  | $ 9,000,000 |  |  |
Settlement funds |  | (5,200,000) |  |  |
Attorney's fee |  | $ 3,800,000 |  |  |
Lawsuit filing date |  |  |  | September 12, 2012 |
Connecticut Class Action |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement amount including attorney's fees |  |  | $ 1,250,000 |  |
Tennessee Class Action |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement amount including attorney's fees | $ 250,000 |  |  |  |

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