National advertising fund	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
National advertising fund	National advertising fund On July 26, 2011, the Company established the NAF for the creation and development of marketing, advertising, and related programs and materials for all Planet Fitness stores located in the United States and Puerto Rico. On behalf of the NAF, the Company collects 2% of gross monthly membership billings from franchisees, in accordance with the provisions of the franchise agreements, which subsequent to the adoption of ASC 606 is reflected on January 1, 2018, is reflected as NAF revenue on the consolidated statements of operations (see Note 2 and Note 10). The Company also contributes 2% of monthly membership billings from stores owned by the Company to the NAF, which is reflected in store operations expense in the consolidated statements of operations. The use of amounts received by the NAF is restricted to advertising, product development, public relations, merchandising, and administrative expenses and programs to increase sales and further enhance the public reputation of the Planet Fitness brand. The Company consolidates and reports all assets and liabilities held by the NAF within the consolidated financial statements. Amounts received or receivable by NAF are reported as restricted assets and restricted liabilities within current assets and current liabilities on the consolidated balance sheets. Beginning in 2018 with the adoption of ASC 606, the Company records all revenues of the NAF within franchise revenue and all expenses of the NAF within the operating expenses on the consolidated statement of operations (see Note 2 and Note 10). The Company provides administrative services to the NAF and charges the NAF a fee for providing those services. These services include accounting, information technology, data processing, product development, legal and administrative support, and other operating expenses, which amounted $2,472, $2,150 and $1,700 for the years ended December 31, 2018, 2017 and 2016, respectively. For the year ended December 31, 2018, subsequent to the adoption of ASC 606, the fees paid to the Company by the NAF are reflected as expense in the NAF expense line, and reflected as a corresponding reduction in general and administrative expenses in the consolidated statements of operations (see Note 2 and Note 10). For the years ended December 31, 2017 and 2016 the fees paid to the Company by the NAF are included in the consolidated statements of operations as a reduction in general and administrative expense, where the expense incurred by the Company was initially recorded.

National advertising fund

On July 26, 2011, the Company established the NAF for the creation and development of marketing, advertising, and related programs and materials for all Planet Fitness stores located in the United States and Puerto Rico. On behalf of the NAF, the Company collects 2% of gross monthly membership billings from franchisees, in accordance with the provisions of the franchise agreements, which subsequent to the adoption of ASC 606 is reflected on January 1, 2018, is reflected as NAF revenue on the consolidated statements of operations (see Note 2 and Note 10). The Company also contributes 2% of monthly membership billings from stores owned by the Company to the NAF, which is reflected in store operations expense in the consolidated statements of operations. The use of amounts received by the NAF is restricted to advertising, product development, public relations, merchandising, and administrative expenses and programs to increase sales and further enhance the public reputation of the Planet Fitness brand. The Company consolidates and reports all assets and liabilities held by the NAF within the consolidated financial statements. Amounts received or receivable by NAF are reported as restricted assets and restricted liabilities within current assets and current liabilities on the consolidated balance sheets. Beginning in 2018 with the adoption of ASC 606, the Company records all revenues of the NAF within franchise revenue and all expenses of the NAF within the operating expenses on the consolidated statement of operations (see Note 2 and Note 10). The Company provides administrative services to the NAF and charges the NAF a fee for providing those services. These services include accounting, information technology, data processing, product development, legal and administrative support, and other operating expenses, which amounted $2,472, $2,150 and $1,700 for the years ended December 31, 2018, 2017 and 2016, respectively. For the year ended December 31, 2018, subsequent to the adoption of ASC 606, the fees paid to the Company by the NAF are reflected as expense in the NAF expense line, and reflected as a corresponding reduction in general and administrative expenses in the consolidated statements of operations (see Note 2 and Note 10). For the years ended December 31, 2017 and 2016 the fees paid to the Company by the NAF are included in the consolidated statements of operations as a reduction in general and administrative expense, where the expense incurred by the Company was initially recorded.