Investments in Joint Ventures and Associates - Summary of Materials (Detail)	12 Months Ended
Dec. 31, 2017
Penguin Random House Ltd [member]
Disclosure of associates [line items]
Name of Associates	Penguin Random House Ltd
Principal place of business	UK/Global
Ownership interest	25.00%
Measurement method	Equity
Penguin Random House LLC [member]
Disclosure of associates [line items]
Name of Associates	Penguin Random House LLC
Principal place of business	US
Ownership interest	25.00%
Measurement method	Equity

The description of whether the investment in an associate is measured using the equity method or at fair value. [Refer: At fair value [member]; Associates [member]]

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The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

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