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Workers' Compensation - Summarizes Aggregate Workers' Compensation Reserve Activity (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
Workers Compensation Reserve [Abstract]        
Workers' compensation claims liabilities, Beginning balance $ 122,506 $ 84,543 $ 112,444 $ 70,564
Add: claims expense accrual:        
Current period 39,876 17,396 73,775 44,825
Prior periods 61,283 5,002 66,387 12,688
Total expense accrual 101,159 22,398 140,162 57,513
Less: claim payments related to:        
Current period 3,995 3,124 7,133 5,998
Prior periods 11,327 7,837 37,130 26,099
Total paid 15,322 10,961 44,263 32,097
Workers' compensation claims liabilities, Ending balance 208,343 95,980 208,343 95,980
Incurred but not reported (IBNR) $ 117,688 $ 59,412 $ 117,688 $ 59,412