Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill impairment charges	$ 13,678,000	$ 0
Amortization expense	266,000,000	$ 54,000,000
Definite-lived intangible assets, amortization expense, 2019	252,000,000
Definite-lived intangible assets, amortization expense, 2020	252,000,000
Definite-lived intangible assets, amortization expense, 2021	236,000,000
Definite-lived intangible assets, amortization expense, 2022	143,000,000
Unitron Acquisition [Member] \| Tradename and Covenant Not to Compete [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Impairment charge related to write-off	$ 62,000,000
OneClick [Member] \| Tradenames [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortization period	60 months
OneClick [Member] \| Covenants [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortization period	48 months
Verykool Business Segment [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill impairment related to discontinued operation	$ 3,343,000

Disposal group including discontinued operation impairment of goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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