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Segment Information - Pre-Tax Depreciation and Amortization by Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization of property and equipment | $ 5,665 | $ 7,319 | $ 18,054 | $ 21,820
Amortization of intangible assets | 7,988 | 9,433 | 24,097 | 29,555
Depreciation and amortization, total | 13,653 | 16,752 | 42,151 | 51,375
North America Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization of property and equipment | 4,376 | 5,907 | 14,047 | 17,559
Amortization of intangible assets | 7,372 | 8,730 | 22,229 | 27,594
EMEA Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization of property and equipment | 1,141 | 1,269 | 3,575 | 3,846
Amortization of intangible assets | 494 | 585 | 1,491 | 1,625
APAC Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization of property and equipment | 148 | 143 | 432 | 415
Amortization of intangible assets | $ 122 | $ 118 | $ 377 | $ 336

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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