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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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- Definition

Loss contingency damages sought percentage of total charge.

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The number of alleged claims in regards to a legal matter that are filed for equitable relief.

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The number of individuals who have filed motions to compel arbitrations regarding certain legal matters.

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The total number of findings related to the Office of Inspector General legal matter.

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- Definition

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Amount awarded to other party in judgment or settlement of litigation.

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Amount of loss contingency liability.

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Date the pending litigation matter was dismissed, in CCYY-MM-DD format.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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The effective date of a duly executed litigation settlement agreement.

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