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Summary of Stock Option Activity (Parenthetical) (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares, Granted | 134,500 |  |
Outstanding amount of stock appreciation right units | 2,406,455 | [1] | 3,316,380
Exercisable amount of stock appreciation right units | 1,562,042 |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding amount of stock appreciation right units | 2,107,339 |  |
Exercisable amount of stock appreciation right units | 1,412,528 |  |
Stock Appreciation Rights (SARs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum percentage of stock appreciation right units | 75.00% |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,107,339 shares of the Company's common stock issuable upon exercise.

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- Details
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