Restructuring and Other Charges - Summary of Restructuring Charges (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Severance and relocation costs	$ 1,921
Contract termination costs	81
Total restructuring charges	2,002
Merger-Related [Member]
Restructuring Cost And Reserve [Line Items]
Severance and relocation costs	1,921
Total restructuring charges	1,921
Idled Facilities [Member]
Restructuring Cost And Reserve [Line Items]
Contract termination costs	81
Total restructuring charges	$ 81

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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