Equity - Narrative (Detail) $ / shares in Units, $ in Millions		9 Months Ended
	Aug. 28, 2019 Vote $ / shares	Sep. 30, 2019 USD ($)	Oct. 01, 2016 Entity
Equity [Line Items]
Number of entities resulted from spinoff of an entity | Entity			2
Rights Agreement
Equity [Line Items]
Common stock, voting rights		Under the terms of the Rights Agreement, each share of our common stock is accompanied by one right; each right entitles the stockholder to purchase from the Company one one-thousandth of a newly issued share of Series A Junior Participating Preferred Stock at an exercise price of $12, subject to adjustment
Number of votes for each common stock held | Vote	1
Acquired beneficial ownership percentage	10.00%
Acquired beneficial ownership percentage in certain circumstances	20.00%
Stock rights redeem price per right	$ 0.001
Common stock rights expiration date	Aug. 28, 2020
Rights Agreement | Series A Junior Participating Preferred Stock
Equity [Line Items]
Common stock shareholders each right entitled to purchase preferred stock	0.001
Preferred stock exercise price	$ 12
Error In Accounting For Distribution of Spin Companies
Equity [Line Items]
Immaterial error correction		During the second quarter of 2019, we identified an error in the accounting for the distribution of the Spin Companies. As a result, the error, which was determined by management to be immaterial to the previously issued Consolidated Financial Statements, has been corrected herein by increasing Accumulated Deficit by $12.0 million.
Error In Accounting For Distribution of Spin Companies | Accumulated Deficit
Equity [Line Items]
Increasing accumulated deficit | $		$ 12.0