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INCOME PER SHARE - Summary of computation of basic and diluted net income per share attribute to ordinary shareholders after stock split (Detail) ¥ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Earnings Per Share [Abstract]
Net income attributable to ordinary shareholders – basic and diluted	¥ 527,747	$ 75,805	¥ 611,758	¥ 539,545
Weighted average number of ordinary shares outstanding – basic | shares	210,409,863	210,409,863	200,000,000	200,000,000
Basic and diluted net income per share | ¥ / shares	¥ 2.51		¥ 3.06	¥ 2.70

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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