Selling, General and Administrative Expenses - Schedule of Selling, General and Administrative Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	$ 197,342	$ 191,402
Personnel expenses
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	149,628	142,480
Operational expenses
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	44,747	46,210
Depreciation and amortization
Component Of Operating Other Cost And Expense [Line Items]
Selling, general and administrative expenses	$ 2,967	$ 2,712

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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