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Contingencies - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2018 Claim | Jun. 08, 2018 USD ($) | Feb. 02, 2018 Plaintiff | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 21, 2016 Member | Mar. 05, 2008 Claim
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement agreement date |  |  | February 2, 2018 |  |  |  |
Loss Contingency Damages Sought Percentage Of Total Charge |  |  | 44.00% |  |  |  |
Number of plaintiffs | Plaintiff |  |  | 1,169 |  |  |  |
Estimated settlement reserve |  |  |  | $ 8,100 |  |  |
Reserve recorded during the current period |  |  |  | 4,900 |  |  |
Loss contingency, initial payment |  | $ 3,000 |  |  |  |  |
Number of individuals WCI file motion to compel arbitration | Member |  |  |  |  |  | 1,100 |
Number of arbitration claims filed | Claim | 325 |  |  |  |  |  |
Attorney's Fees and Costs [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated settlement reserve |  |  |  | 4,900 |  |  |
Reserve recorded during the current period |  |  |  | 1,100 |  |  |
Court awarded settlement amount |  | 4,900 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated settlement reserve |  | 11,100 |  |  |  |  |
Maximum [Member] | Attorney's Fees and Costs [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement awarded amount |  | 8,000 |  |  |  |  |
Minimum [Member] | Attorney's Fees and Costs [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement awarded amount |  | $ 3,750 |  |  |  |  |
Surrett [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of alleged claims for equitable relief | Claim |  |  |  |  |  |  | 2
Other Accrued Expenses [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual for legal fees and settlements |  |  |  | $ 13,800 | $ 8,700 |  |

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