Long-Term Debt, Short-Term Debt, and Financing Arrangements - Financial Ratios Under Senior Credit Facility (Detail)	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Leverage Ratio Required Each Quarter Thereafter	3.50
Required
Debt Instrument [Line Items]
Leverage Ratio (maximum)	3.5	3.5	3.5	3.5
Interest Coverage Ratio (minimum)	2.75	2.75	2.75	2.75
Actual
Debt Instrument [Line Items]
Leverage Ratio (maximum)	1.47	1.53	1.47	1.55
Interest Coverage Ratio (minimum)	14.7	14.14	13.74	13.75