Short-Term Debt - Credit Facilities (Parenthetical) (Detail)		12 Months Ended
	Mar. 24, 2015	Dec. 31, 2016	Dec. 31, 2015
5-year Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date		Dec. 17, 2018	Dec. 17, 2018
3-year Accounts Receivable Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility maturity date	Mar. 23, 2018	Mar. 23, 2018	Mar. 23, 2018