Nature of operations equity sponsor and related party transactions.

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Proceeds from issuance initial public offering net of underwriting discount and expenses.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Nature of Operations Equity Sponsor and Related Party Transactions - Additional Information (Detail) $ / shares in Units, $ in Millions			12 Months Ended
	Dec. 16, 2018	Feb. 01, 2017 USD ($) $ / shares shares	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 30, 2018 USD ($)
Nature Of Operations Equity Sponsor And Related Party Transactions [Line Items]
Net proceeds after deducting underwriting discount and expenses				$ 253.6
Stock split ratio			80
Primary Equity Holder [Member]
Nature Of Operations Equity Sponsor And Related Party Transactions [Line Items]
Selling, general and administrative expenses charged by primary equity holder			$ 0.9	$ 0.6	$ 0.2
American Industrial Partners [Member] \| Subsequent Event [Member]
Nature Of Operations Equity Sponsor And Related Party Transactions [Line Items]
Equity interest held by operating partnership, voting equity	53.90%
IPO [Member]
Nature Of Operations Equity Sponsor And Related Party Transactions [Line Items]
Issuance of common stock \| shares		12,500,000
Price per share \| $ / shares		$ 22.00
Gross proceeds		$ 275.0
Net proceeds after deducting underwriting discount and expenses		$ 253.6
China JV [Member]
Nature Of Operations Equity Sponsor And Related Party Transactions [Line Items]
Investments in joint ventures			$ 6.7			$ 0.9
Equity interest in joint ventures						10.00%
Loan interest rate			5.00%