Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Additional Information (Detail)

v3.6.0.2
Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2016
Sep. 13, 2016
Sep. 12, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]          
Preferred stock, shares authorized 5,000,000     100,000  
Common stock, shares issued 14,992,018 14,992,018 14,992,018 81,252,676  
Common stock, par value $ 0.01 $ 0.01 $ 12.73 $ 0.01  
Common stock, shares authorized 45,000,000     228,000,000  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Accumulated other comprehensive losses attributable to pension and postretirement benefit obligations, net of tax $ 0.1   $ 0.1 $ 0.4 $ 0.2
Treasury stock (in shares) 0     455,689