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Capital Stock (Detail) - shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |
Beginning balance | 168,628,177 | 163,342,894
Restricted stock grants | 334,201 | 270,062
Restricted stock units vested | 247,201 | 244,413
Treasury shares issued | 22,939 | 15,566
Ending balance | 169,309,520 | 168,628,177
Common Stock | Equity Offering |  |
Class Of Stock [Line Items] |  |
Equity offering | 0 | 4,560,000
Stock Appreciation Rights (SARs) |  |
Class Of Stock [Line Items] |  |
SARs exercised | 77,002 | 195,242

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