Comparison of Financial Statements to Pro-Forma Amounts had Previous Guidance been in Effect (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Assets
Accounts receivable		$ 1,183,360		$ 1,183,360		$ 1,218,089
Other current assets		196,014		196,014		145,953
Deferred income taxes		146,443		146,443		115,436
Liabilities
Deferred revenue (current and non-current)		181,823		181,823		$ 168,757
Revenues
Net sales		1,726,540	$ 1,664,170	3,304,250	$ 3,147,276
Costs and expenses
Cost of sales		1,227,785	1,260,813	2,329,812	2,406,661
Income tax (benefit) expense		(9,944)	(8,302)	(6,454)	1,699
Consolidated net income (loss)		34,799	28,474	17,766	(12,557)
Net loss attributable to non-controlling interest		(955)	(1,862)	(4,388)	(3,795)
Net income (loss) attributable to ARRIS International plc		$ 35,754	$ 30,336	$ 22,154	$ (8,762)
Net income (loss) per ordinary share:
Basic	[1]	$ 0.19	$ 0.16	$ 0.12	$ (0.05)
Diluted	[1]	$ 0.19	$ 0.16	$ 0.12	$ (0.05)
Pro Forma
Assets
Accounts receivable		$ 1,163,234		$ 1,163,234
Other current assets		195,950		195,950
Deferred income taxes		140,831		140,831
Liabilities
Deferred revenue (current and non-current)		190,220		190,220
Revenues
Net sales		1,714,584		3,275,727
Costs and expenses
Cost of sales		1,227,785		2,329,876
Income tax (benefit) expense		(6,964)		(843)
Consolidated net income (loss)		19,863		(16,432)
Net loss attributable to non-controlling interest		(1,540)		(5,130)
Net income (loss) attributable to ARRIS International plc		$ 21,403		$ (11,302)
Net income (loss) per ordinary share:
Basic		$ 0.12		$ (0.06)
Diluted		$ 0.12		$ (0.06)

[1] Calculated based on net income (loss) attributable to stockholders of ARRIS International plc