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Capital Stock (Detail) - shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |
Beginning balance | 247,144,356 | 169,316,460
Restricted stock grants | 536,536 | 490,609
Restricted stock units vested | 341,358 | 266,541
PSU-TSR units settled | 85,461 | 0
Shares retired | 0 | (739)
Treasury shares issued | 15,580 | 28,736
Ending balance | 248,123,291 | 247,144,356
MRD |  |
Class Of Stock [Line Items] |  |
MRD Merger | 0 | 77,042,749

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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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