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Workers' Compensation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summarizes aggregate workers' compensation reserve activity        
Workers' compensation claims liabilities, Beginning balance $ 77,212 $ 52,794 $ 70,564 $ 51,193
Add: claims expense accrual:        
Current period 14,752 8,170 27,429 16,333
Prior periods 4,234 3,110 7,686 3,110
Total expense accrual 18,986 11,280 35,115 19,443
Less: claim payments related to:        
Current period 2,448 1,304 2,874 1,583
Prior periods 9,207 7,005 18,262 13,288
Total paid 11,655 8,309 21,136 14,871
Workers' compensation claims liabilities, Ending balance 84,543 55,765 84,543 55,765
Incurred but not reported (IBNR) $ 56,434 $ 41,000 $ 56,434 $ 41,000