Overview and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Accounting Policies [Abstract]
Initial offering period		December 2011
Increase in revenue and income from operations	$ 0.5	$ 0.5
Impact on reported earnings per share	$ 0	$ 0.01
Revenue and income from operations	$ 0.2	$ 3.8