Long-Term Debt and Financing Arrangements - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Standby Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Letters of credit expiration date	various dates in 2016 and 2017
Outstanding letters of credit	$ 8.2
Revolving Line of Credit Facility [Member] | Bank Revolving Line of Credit [Member]
Line Of Credit Facility [Line Items]
Unused and available borrowings under variable rate bank revolving line of credit	$ 41.8	$ 41.8