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Summary of Stock Option Activity (Parenthetical) (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding amount of stock appreciation right units | [2] | 729,017 | [1] | 1,455,908
Exercisable amount of stock appreciation right units | [2],[3] | 513,464 |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding amount of stock appreciation right units |  | 662,075 |  |
Exercisable amount of stock appreciation right units |  | 465,223 |  |
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 662,075 shares of the Company's common stock issuable upon exercise.
[2] | The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 465,223 shares of the Company's common stock issuable upon exercise.

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