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Contingencies - Additional Information (Detail) $ in Thousands		3 Months Ended
	Feb. 02, 2018 USD ($) Plaintiff	Mar. 31, 2018 USD ($) Claim	Apr. 02, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 21, 2016 Member	Jan. 13, 2012 Finding	Mar. 05, 2008 Claim
Loss Contingencies [Line Items]
Accrual for legal fees and settlements	$ 6,300	$ 11,800		$ 8,700
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		6,300
Reserve recorded during the current period		3,500
Litigation settlement reserve		$ 3,750
Number of arbitration claims filed | Claim		115
Number of individuals WCI file motion to compel arbitration | Member					1,100
Number of OIG Findings | Finding						3
Maximum [Member]
Loss Contingencies [Line Items]
Estimated settlement reserve	$ 14,000
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
OIG Audit [Member] | Maximum [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Estimated settlement reserve			$ 1,000

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Loss contingency damages sought percentage of total charge.

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+ References

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Amount of loss contingency liability.

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