Equity - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2016	May 31, 2016	Dec. 31, 2015
Equity [Line Items]
Common stock, par value			$ 0.01	$ 0.01	$ 1.25
Common Stock
Equity [Line Items]
Issuances of stock		$ 154.2
Common Stock | Courier Corporation
Equity [Line Items]
Issuances of stock	$ 154.2