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Contingencies - Additional Information (Detail) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2018 USD ($) Plaintiff | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 21, 2016 Member | Jan. 13, 2012 Finding | Mar. 05, 2008 Claim
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual for legal fees and settlements |  | $ 8,700,000 | $ 34,500,000 |  |  |
Estimated settlement reserve |  | 2,800,000 |  |  |  |
Litigation settlement reserve |  | $ 3,750,000 |  |  |  |
Number of individuals WCI file motion to compel arbitration | Member |  |  |  | 1,100 |  |
Number of OIG Findings | Finding |  |  |  |  | 3 |
Subsequent Event [Member] |  |  |  |  |  |
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 |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual for legal fees and settlements | $ 2,800,000 |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] | Attorney’s Fees and Costs [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement awarded amount | 3,750,000 |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimated settlement reserve | 14,000,000 |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Attorney’s Fees and Costs [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement awarded amount | $ 8,000,000 |  |  |  |  |
Surrett [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of alleged claims for equitable relief | Claim |  |  |  |  |  | 2
False Claims Act [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Case dismissal date |  | Jan. 22, 2018 |  |  |  |
OIG Audit [Member] | Maximum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimated settlement reserve |  | $ 1,000,000 |  |  |  |

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