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Equity - Exchangeable Shares and Series F and Series G Preferred Stock (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 shares | Sep. 30, 2016 shares | Sep. 30, 2017 Acquisition shares | Sep. 30, 2016 shares | Dec. 31, 2016 shares
Class of Stock [Line Items] |  |  |  |  |
Number of shares of Common stock received for each exchangeable share (in shares) |  |  | 1 |  |
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less (in shares) |  |  | 50,000 |  |
Number of business acquisitions having issuances of preferred stock | Acquisition |  |  | 2 |  |
Common stock, shares outstanding (in shares) | 151,206,729 |  | 151,206,729 |  | 144,710,773
Series F Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (in shares) | 1 |  | 1 |  | 1
Preferred stock, shares outstanding (in shares) | 1 |  | 1 |  | 1
Series G Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (in shares) | 1 |  | 1 |  | 1
Preferred stock, shares outstanding (in shares) | 1 |  | 1 |  | 1
Exchangeable Shares For Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exchangeable shares exchanged for common stock (in shares) | 0 | 300,000 | 2,500,000 | 300,000 |
Exchangeable Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | 3,986,112 |  | 3,986,112 |  | 6,515,453
Exchangeable Shares Associated With Series F And Series G Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | 3,900,000 |  | 3,900,000 |  |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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