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STOCK-BASED COMPENSATION - Fair Value Assumptions (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Weighted-average assumptions used to estimate the fair value of options granted |  |  |  |  |  |  |
Dividend yield (as a percent) | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Expected volatility (as a percent) | 36.30% |  |  | 36.70% | 36.10% | 37.10% |
Risk-free interest rate (as a percent) | 1.10% |  |  | 1.50% | 1.40% | 1.60% |
Expected term | 6 years 4 months 24 days |  |  | 6 years 1 month 6 days | 6 years 3 months 18 days | 5 years 9 months 18 days |
Stock Options, Number of Shares |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 6,590 |  | 6,590 |  |
Granted (in shares) | (14) | 219 | 961 |  |  |  |
Exercised (in shares) |  |  |  |  | (284) |  |
Cancelled or forfeited (in shares) |  |  |  |  | (88) |  |
Balance at the end of the period (in shares) | 7,412 |  |  |  | 7,412 |  | 6,590
Vested and expected to vest in the future at the end of the period (in shares) | 7,011 |  |  |  | 7,011 |  |
Exercisable at the end of the period (in shares) | 4,359 |  |  |  | 4,359 |  |
Stock options, Weighted-Average Exercise Price Per Share |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  | $ 50.85 |  | $ 50.85 |  |
Granted (in dollars per share) | $ 157.80 | $ 138.53 | $ 132.06 |  |  |  |
Exercised (in dollars per share) |  |  |  |  | 37.34 |  |
Cancelled or forfeited (in dollars per share) |  |  |  |  | 98.28 |  |
Balance at the end of the period (in dollars per share) | 64.14 |  |  |  | 64.14 |  | $ 50.85
Vested and expected to vest in the future at the end of the period (in dollars per share) | 60.94 |  |  |  | 60.94 |  |
Exercisable at the end of the period (in dollars per share) | $ 31.77 |  |  |  | $ 31.77 |  |
Weighted-Average Remaining Contractual Term |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  | 5 years 7 months 6 days |  | 5 years 7 months 6 days
Balance at the end of the period |  |  |  |  | 5 years 7 months 6 days |  | 5 years 7 months 6 days
Vested and expected to vest in the future at the end of the period |  |  |  |  | 5 years 4 months 24 days |  |
Exercisable at the end of the period |  |  |  |  | 3 years 8 months 12 days |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 646,497 |  | $ 646,497 |  |
Balance at the end of the period | $ 613,113 |  |  |  | 613,113 |  | $ 646,497
Vested and expected to vest in the future at the end of the period | 602,318 |  |  |  | 602,318 |  |
Exercisable at the end of the period | $ 501,457 |  |  |  | $ 501,457 |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition Weighted average price of options that were either forfeited or 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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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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