Restructuring and Other Charges - Summary of Restructuring Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost And Reserve [Line Items]
Beginning balances	$ 8,212	$ 19,552
Charges		2,002
Cash payments	(4,719)	(3,286)
Ending Balances	3,493	18,268
Merger-Related [Member]
Restructuring Cost And Reserve [Line Items]
Beginning balances	7,735	15,578
Charges		1,921
Cash payments	(4,498)	(2,707)
Ending Balances	3,237	14,792
Idled Facilities [Member]
Restructuring Cost And Reserve [Line Items]
Beginning balances	477	3,974
Charges		81
Cash payments	(221)	(579)
Ending Balances	$ 256	$ 3,476

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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