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Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Options outstanding, shares |  |  |
Beginning Balance | 1,201 | 600 | 16
Granted | 380 | 745 | 600
Exercised | (91) | (9) | (16)
Forfeited/Expired | (167) | (135) | 0
Ending Balance | 1,323 | 1,201 | 600
Exercisable as of December 31, 2015 | 334 |  |
Expected to vest as of December 31, 2015 | 989 |  |
Total | 1,323 |  |
Weighted Average Exercise Price Per Share |  |  |
Beginning Balance | $ 111.77 | $ 92.84 | $ 20.81
Granted | 178.93 | 125.46 | 92.84
Exercised | 105.25 | 92.84 | 20.81
Forfeited/Expired | 131.31 | 104.48 | 0
Ending Balance | 129.04 | $ 111.77 | $ 92.84
Exercisable as of December 31, 2015 | 105.20 |  |
Expected to vest as of December 31, 2015 | 137.09 |  |
Total | $ 129.04 |  |
Aggregate Intrinsic Value |  |  |
Exercised | $ 6,367 | $ 653 | $ 1,262
Exercisable as of December 31, 2015 | 24,746 |  |
Expected to vest as of December 31, 2015 | 44,581 |  |
Total | $ 69,327 |  |
Weighted Average Remaining Contractual Term (Years) |  |  |
Exercisable as of December 31, 2015 | 7 years 10 months 24 days |  |
Expected to vest as of December 31, 2015 | 8 years 7 months 6 days |  |
Total | 8 years 4 months 24 days |  |

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- Definition Weighted average remaining contractual term of share options expected to vest at the date of the latest statement of financial position. Excludes options already vested. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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