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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Income Taxes |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | $ 3,800 |  |  | $ 3,800 |  |  |
Unrecognized tax benefits would impact the effective tax rate |  | 3,200 |  |  | 3,200 |  |  |
Unrecognized tax benefits expected to decrease in the next 12 months due to expiration of applicable statute of limitation |  | 1,200 |  |  | 1,200 |  |  |
Interest accrued |  | 700 |  |  | $ 700 |  |  |
Effective tax rate from operations |  |  |  |  | 22.40% | (3.80%) |  |
Provision for (benefit from) income taxes |  | (291) |  | $ (1,240) | $ 6,419 | $ (699) |  |
Effective U.S corporate tax rate |  |  |  |  | 21.00% |  | 35.00% |
Provision for transition tax |  |  |  |  |  |  |  | $ 37,200
Transition tax paid |  |  |  |  |  |  |  | 8,300
Transition tax |  | 28,900 |  |  | $ 28,900 |  |  |
Transition Tax over an eight-year period beginning |  |  |  |  | 2018 |  |  |
Retained earnings |  | 571,322 |  |  | $ 571,322 |  |  | 549,134
Undistributed foreign earnings |  | 197,400 |  |  | 197,400 |  |  |
Other Long-term Liabilities |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Transition tax |  | 28,000 |  |  | 28,000 |  |  |
Accounts Payable, Accrued Expenses and Operating Lease Liabilities |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Transition tax |  | 900 |  |  | 900 |  |  |
Voice.com Domain Name |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 8,100 |  | $ 8,100 |  |  |  |  |
Voice.com Domain Name | Other Income, Net |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Net gain on sale of domain name | $ 29,800 |  | $ 29,800 |  |  |  |  |
U.S |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term investments |  | 311,900 |  |  | $ 311,900 |  |  | 173,600
U.S | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2015 |  |  |
Italy | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2016 |  |  |
Poland | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2014 |  |  |
Spain | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2015 |  |  |
United Kingdom | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2017 |  |  |
Germany | Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Tax years subject to examination |  |  |  |  | 2016 |  |  |
Foreign |  |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term investments |  | $ 266,400 |  |  | $ 266,400 |  |  | 402,500
Retained earnings |  |  |  |  |  |  |  | $ 397,400
Offshore receipts in respect of intangible property legislation tax payments percentage |  |  |  |  | 20.00% |  |  |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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