Commitments and Contingencies - Narrative (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Self insurance deductible for workers compensation	$ 2.5
Self insurance deductible for general liability claims	1.0
Self insurance deductible for automobile liability	1.0
Self insurance deductible for medical and dental coverage	0.4
Self-insured risk accruals	$ 31.1	$ 30.8