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Share Capital - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Employee Stock Option | Dec. 31, 2012 Employee Stock Option | Dec. 31, 2011 Employee Stock Option | Dec. 31, 2013 Restricted Stock Units (RSUs) | Dec. 31, 2011 Restricted Stock Units (RSUs) | Oct. 27, 2011 Maximum | Nov. 22, 2011 Plan 1 | Nov. 22, 2011 Plan 1 Maximum | Nov. 22, 2011 Plan 2 | Nov. 22, 2011 Plan 2 Maximum | Feb. 21, 2012 Plan 3 | Feb. 21, 2012 Plan 3 Maximum | Apr. 27, 2012 Plan 4 | Apr. 27, 2012 Plan 4 Maximum | Jul. 30, 2012 Plan 5 | Jul. 30, 2012 Plan 5 Maximum
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share allotment description | Every holder of an ordinary share present in person or proxy at a general meeting of shareholders shall have one vote, for each ordinary share held with no individual having more than one vote. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised by employees |  |  |  | 1,249,759 | 890,236 | 430,340 |  |  |  |  |  |  |  |  |  |  |  |  |
Average exercise price of Option per share |  |  |  | $ 21.60 | $ 14.62 | $ 10.84 |  |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds from exercise of stock options by employees |  |  |  | $ 27,000,000 | $ 13,000,000 | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued in respect of certain RSU's previously awarded by the Company |  |  |  |  |  |  | 50,000 | 3,768 |  |  |  |  |  |  |  |  |  |  |
Share repurchase program value |  |  |  |  |  |  |  |  | 50,000,000 |  | 10,000,000 |  | 10,000,000 |  | 20,000,000 |  | 20,000,000 |  | 10,000,000
Share repurchase plans, start date |  |  |  |  |  |  |  |  |  | Nov. 23, 2011 |  | Jan. 01, 2012 |  | Feb. 22, 2012 |  | Apr. 27, 2012 |  | Jul. 30, 2012 |
Share repurchase plans, end date |  |  |  |  |  |  |  |  |  | Dec. 31, 2011 |  | Feb. 20, 2012 |  | Apr. 22, 2012 |  | Jul. 18, 2012 |  | Oct. 26, 2012 |
Ordinary shares repurchased |  | 738,341 | 545,597 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares repurchased, value |  | 15,605,000 | 9,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total ordinary shares repurchased |  | 1,283,938 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total ordinary shares repurchased, value |  | $ 24,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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