Earnings (Losses) Per Share - Summary of Basic Earnings Per Share (Parenthetical) (Detail) - S/ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share [line items]
Weighted average number of shares issued per share	S/ 1.00	S/ 1.00	S/ 1.00

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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Balance Type:	na
Period Type:	duration