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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 277,050	$ 239,245	$ 255,675	$ 225,278
Add: claims expense accrual:
Current period	38,094	29,723	103,875	84,943
Prior periods	(999)	(2,424)	(1,547)	(9,659)
Total expense accrual	37,095	27,299	102,328	75,284
Less: claim payments related to:
Current period	5,596	4,974	10,565	8,730
Prior periods	16,618	13,799	55,507	44,061
Total paid	22,214	18,773	66,072	52,791
Workers' compensation claims liabilities, Ending balance	291,931	247,771	291,931	247,771
Incurred but not reported (IBNR)	$ 145,722	$ 125,574	$ 145,722	$ 125,574

X

- Definition

Claim payments.

+ References

No definition available.

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- Definition

Claim payments prior period.

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X

- Definition

Claims expense accrual.

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X

- Definition

Workers compensation claim payments.

+ References

No definition available.

+ Details

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- Definition

Workers compensation claim payments current period.

+ References

No definition available.

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- Definition

Workers compensation expense accrual claims.

+ References

No definition available.

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- Definition

Workers compensation expense accrual claims for current period.

+ References

No definition available.

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- Definition

Workers compensation expense adjustments accrual claims for prior periods.

+ References

No definition available.

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- Definition

Workers compensation incurred but not reported.

+ References

No definition available.

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- Definition

workers compensation reserve.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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(20))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: 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(24))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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