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Equity - Exchangeable Shares and Series F and Series G Preferred Stock (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 shares | Jun. 30, 2016 shares | Jun. 30, 2017 Acquisition shares | Jun. 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) | 148,490,467 |  | 148,490,467 |  | 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 | 0 | 2,500,000 | 0 |
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=6928386&loc=d3e21463-112644 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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