Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Number of Shares Sold	44.1	36.5	9.5
Average Price Per Share	$ 18.76	$ 13.98	$ 13.71
Net Proceeds	$ 788,045	$ 492,129	$ 129,684

Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Equity [Abstract]

Number of Shares Sold

44.1

36.5

9.5

Average Price Per Share

$ 18.76

$ 13.98

$ 13.71

Net Proceeds

$ 788,045

$ 492,129

$ 129,684