Changes in Self Insurance Reserves (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Disclosure Changes in Self Insurance Reserves [Abstract]
Beginning Balance	$ 27,600,000	$ 55,800,000
Accruals (reversals), net	(1,200,000)	(900,000)
Payments	(7,300,000)	(27,300,000)
Ending Balance	$ 19,100,000	$ 27,600,000