Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 12, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Class of Stock [Line Items]
Stockholders' Equity, Other		$ 1,473
Share-based compensation (equity-classified)	$ 0	$ (1,511)	$ (3,918)	$ (3,369)
Other Comprehensive loss, pension and postretirements obligations, before tax			$ 0
Common stock, shares authorized	45,000,000		45,000,000		228,000,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued	0		0		3,915
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued	0		0		27,551
Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of Stock, Shares Converted			52	12,619
Depositary Shares
Class of Stock [Line Items]
Conversion of Stock, Shares Converted			5,159	1,261,850
Preferred Stock, Dividend Rate, Percentage			6.00%