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Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
A.S.E. Holding Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Bermuda |
Percentage of Ownership (%) | 100.00% | 100.00%
J & R Holding Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Bermuda |
Percentage of Ownership (%) | 100.00% | 100.00%
Innosource Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
Omniquest Industrial Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Marketing & Service Japan Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in marketing and sales services |
Establishment and Operating Location | Japan |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Test, Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the testing of semiconductors |
Establishment and Operating Location | Kaohsiung, ROC |
Percentage of Ownership (%) | 100.00% | 100.00%
USI [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in investing activity |
Establishment and Operating Location | Nantou, ROC |
Percentage of Ownership (%) | 99.20% | 99.20%
Luchu development corporation [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development of real estate properties |
Establishment and Operating Location | Taipei, ROC |
Percentage of Ownership (%) | 86.10% | 86.10%
TLJ Intertech Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in information software services |
Establishment and Operating Location | Taipei, ROC |
Percentage of Ownership (%) | 60.00% | 60.00%
Alto Enterprises Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
Super Zone Holdings Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Hong Kong |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE (Kun Shan) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Investment (Kun Shan) Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Advanced Semiconductor Engineering (China) Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Will engage in the packaging and testing of semiconductors |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Investment (Labuan) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Malaysia |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Test Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Singapore |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE (Korea) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Korea |
Percentage of Ownership (%) | 100.00% | 100.00%
J&R Industrial Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in leasing equipment and investing activity |
Establishment and Operating Location | Kaohsiung, ROC |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Japan Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Japan |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE (U.S.) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | After-sales service and sales support |
Establishment and Operating Location | U.S.A. |
Percentage of Ownership (%) | 100.00% | 100.00%
Global Advanced Packaging Technology Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE WeiHai Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Shandong, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Suzhou ASEN Semiconductors Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Suzhou, China |
Percentage of Ownership (%) | 60.00% | 60.00%
Anstock Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in financing activity |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
Anstock II Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in financing activity |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Module (Shanghai) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Absorbed by ASE (Shanghai) Inc. in February 2017 |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) |  | 100.00%
ASE (Shanghai) Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the production of substrates |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Corporation [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Mauritius Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Mauritius |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Labuan Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Malaysia |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Hui Real Estate Development Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development, construction and sale of real estate properties |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Qi Property Management Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the management of real estate properties |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Advanced Semiconductor Engineering (HK) Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the trading of substrates |
Establishment and Operating Location | Hong Kong |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Wei Real Estate Development Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Yu Real Estate Development Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Fan Department Store Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in department store business |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Kun Shan Ding Yue Real Estate Development Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development, construction and leasing of real estate properties and was disposed of in June 2017(Note 29) |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) |  | 100.00%
Kun Shan Ding Hong Real Estate Development Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Shanghai Ding Xu Property Management Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the management of real estate properties, and was established in August 2017 |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% |
ASE Electronics Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the production of substrates |
Establishment and Operating Location | Kaohsiung, ROC |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Test Holdings, Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Holdings (Singapore) Pte. Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Singapore |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Singapore Pte. Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Singapore |
Percentage of Ownership (%) | 100.00% | 100.00%
ISE Labs, Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the testing of semiconductors |
Establishment and Operating Location | U.S.A. |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Electronics (M) Sdn. Bhd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Malaysia |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Assembly & Test (Shanghai) Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
ASE Trading (Shanghai) Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in trading activity |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Wuxi Tongzhi Microelectronics Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location | Wuxi, China |
Percentage of Ownership (%) | 100.00% | 100.00%
Huntington Holdings International Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Unitech Holdings International Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Real Tech Holdings Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Universal ABIT Holding Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | In the process of liquidation |
Establishment and Operating Location | British Cayman Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Rising Capital Investment Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Rise Accord Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | British Virgin Islands |
Percentage of Ownership (%) | 99.20% | 99.20%
Universal Scientific Industrial (Kunshan) Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the manufacturing and sale of computer assistance system and related peripherals |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) | 99.20% | 99.20%
USI Enterprise Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the services of investment advisory and warehousing management |
Establishment and Operating Location | Hong Kong |
Percentage of Ownership (%) | 96.90% | 97.00%
USISH [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the designing, manufacturing and sale of electronic components |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Technology Co., Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Holding company |
Establishment and Operating Location | Hong Kong |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Technology (Kunshan) Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the designing and manufacturing of electronic components |
Establishment and Operating Location | Kun Shan, China |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Technology (Shanghai) Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the processing and sales of computer and communication peripherals as well as business in import and export of goods and technology |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Electronics (Shanghai) Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the sale of electronic components and telecommunications equipment |
Establishment and Operating Location | Shanghai, China |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Industrial Co., Limited [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in manufacturing, trading and investing activity |
Establishment and Operating Location | Hong Kong |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Global Scientific Industrial Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the manufacturing of components of telecomm and cars and provision of related R&D services |
Establishment and Operating Location | Nantou, ROC |
Percentage of Ownership (%) | 75.80% | 75.90%
USI America Inc. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the manufacturing and processing of motherboards and wireless network communication and provision of related technical service. |
Establishment and Operating Location | U.S.A. |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Scientific Industrial De Mexico S.A. De C.V. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the assembling of motherboards and computer components |
Establishment and Operating Location | Mexico |
Percentage of Ownership (%) | 75.80% | 75.90%
USI Japan Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the manufacturing and sale of computer peripherals, integrated chip and other related accessories |
Establishment and Operating Location | Japan |
Percentage of Ownership (%) | 75.80% | 75.90%
USI Electronics (Shenzhen) Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the design, manufacturing and sale of motherboards and computer peripherals |
Establishment and Operating Location | Shenzhen, China |
Percentage of Ownership (%) | 75.80% | 75.90%
Universal Scientific Industrial Co., Ltd. [member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Business | Engaged in the manufacturing, processing and sale of computers, computer peripherals and related accessories |
Establishment and Operating Location | Nantou, ROC |
Percentage of Ownership (%) | 75.50% | 75.20%

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