Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Number of Shares Sold		0.7	44.1
Average Price Per Share		$ 18.15	$ 18.76
Net Proceeds	$ 0	$ 11,635	$ 788,045

Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Equity [Abstract]

Number of Shares Sold

0.7

44.1

Average Price Per Share

$ 18.15

$ 18.76

Net Proceeds

$ 0

$ 11,635

$ 788,045