Organization (Detail) $ in Millions		12 Months Ended
Jan. 06, 2017 USD ($)	Dec. 31, 2018 Segment Location
Business Acquisition [Line Items]
Number of geographic segments \| Segment		3
Number of headquarter locations \| Location		3
Technology Alliance Inc.
Business Acquisition [Line Items]
Consideration transferred \| $	$ 20.0

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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