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Combined Stock Options and Stock Appreciation Rights Activity (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Number of Shares |  |
Options and SAR's outstanding at beginning of year | 2,108,003 | 1,625,253
Granted | 204,000 | 679,000
Cancelled | (212,749) | (74,187)
Expired | (7,714) | (875)
Exercised | (297,855) | (121,188)
Options and SAR's outstanding at end of year | 1,793,685 | 2,108,003
Weighted average exercise price |  |
Options and SAR's outstanding at beginning of year | $ 7.26 | $ 6.92
Granted | $ 12.06 | $ 6.98
Cancelled | $ 6.58 | $ 6.41
Expired | $ 1.68 | $ 3.04
Exercised | $ 4.74 | $ 1.60
Options and SAR's outstanding at end of year | $ 8.30 | $ 7.26

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