Goodwill and Intangibles - Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 206,113	$ 202,687
Accumulated Amortization	(121,744)	(103,085)
Net Carrying Amount	84,369	99,602
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	156,557	157,286
Accumulated Amortization	(113,871)	(98,937)
Net Carrying Amount	42,686	58,349
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,556	45,401
Accumulated Amortization	(7,873)	(4,148)
Net Carrying Amount	$ 41,683	$ 41,253