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Restatement of Previously Issued Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Total workers' compensation claims expense							$ 115,600							$ 109,057	$ 171,033		$ 92,165
Change in estimate workers' compensation claims expense relating to prior period							61,300							(13,683)	66,719		22,457
Workers' compensation expense		$ 44,734	$ 45,290	$ 41,485	$ 39,628	$ 35,090	33,661	$ 115,518	$ 29,182	$ 38,265	$ 32,671	$ 28,459	$ 24,032	171,137	213,451	[1]	123,427	[1]
Increased workers' compensation claims liabilities	$ 84,700													$ 30,397	104,223	[1]	42,544	[1]
Prior Period Adjustments [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Workers' compensation expense				$ (412)	$ (255)	$ (3,465)	$ (81,932)	$ 84,742	$ 1,582	$ 4,670	$ 4,448	$ 3,481	$ 2,211
Increased workers' compensation claims liabilities															$ 685		$ 664
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements

X

- Definition

Cost of services workers compensation.

+ References

No definition available.

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- Definition

Workers compensation expense accrual claims.

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- Definition

Workers compensation expense accrual claims for prior periods.

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- Definition

The increase (decrease) during the reporting period in the amount due for insurance (or actual expenses) to cover the medical expenses and lost income for employees that are injured during the course of doing work-related activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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