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Summary of Significant Accounting Policies (Self-Insurance) - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Employer's liability claims subject to deductible per occurrence	$ 1,000,000
Worker's compensation claims per occurrence	5,000,000
Auto liability insurance claims deductible	10,000,000
General liability insurance claims deductible	10,000,000
Employee health care benefit plans subject to deductible per claimant	$ 400,000