| Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |