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Workers' Compensation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total workers' compensation claims expense	$ 101,159	$ 22,398	$ 140,162	$ 57,513
Change in estimate workers' compensation claims expense relating to prior period	$ 61,283	$ 5,002	$ 66,387	$ 12,688

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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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