Supplemental Guarantor Financial Statements - Condensed Consolidating Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Supplemental Guarantor Financial Statements [Line Items]
Cash and cash equivalents	$ 95,222	$ 729,808	$ 95,222	$ 109,577	$ 95,222	$ 434,159
Accounts receivable, net					239,428	169,951
Prepaid expenses and other current assets					32,598	27,511
Prepaid income taxes					39,319	40,627
Restricted cash					2,818	2,818
Net property, plant and equipment					69,557	67,143
Deferred income taxes, long-term					2,018	2,199
Goodwill, intangible and other assets, net					5,207,879	5,057,834
Total assets					5,688,839	5,802,242
Less current portion of long-term debt					30,878	32,281
Accounts payable					20,033	11,957
Accrued expenses					124,186	149,028
Income taxes payable						1,428
Deferred revenue					238,785	222,024
Long-term debt, net of current portion (Note 2)					2,569,971	2,719,070
Other long-term liabilities					61,915	51,434
Deferred income taxes, long-term					478,641	509,574
Total liabilities					3,524,409	3,696,796
Total stockholders’ equity					2,164,430	2,105,446
Total liabilities and stockholders’ equity					5,688,839	5,802,242
Revenues	373,077	212,768	697,208	418,503
Cost of revenues	210,479	109,503	387,163	221,810
Gross profit	162,598	103,265	310,045	196,693
Operating expenses:
Selling and marketing	28,535	13,931	58,396	27,318
Research and development	40,827	17,520	77,274	37,128
General and administrative	27,199	13,463	57,894	30,763
Total operating expenses	96,561	44,914	193,564	95,209
Operating income	66,037	58,351	116,481	101,484
Interest expense, net	(32,846)	(5,419)	(65,935)	(11,019)
Other (expense) income, net	12	(164)	(1,835)	(1,671)
Income before income taxes	33,203	52,768	48,711	88,794
Provision for income taxes	4,982	13,640	13,485	23,420
Net income	28,221	39,128	35,226	65,374
Other comprehensive income (loss), net of tax:
Foreign currency exchange translation adjustment	(26,793)	22,808	(17,472)	(13,411)
Comprehensive income	1,428	61,936	17,754	51,963
Cash Flow from Operating Activities:
Net income	28,221	39,128	35,226	65,374
Non-cash adjustments			100,256	51,339
Changes in operating assets and liabilities			3,854	(15,991)
Net cash provided by operating activities			139,336	100,722
Cash Flow from Investment Activities:
Additions to property and equipment			(13,593)	(5,750)
Proceeds from sale of property and equipment			43
Cash paid for business acquisitions, net of cash acquired			(317,554)	(7,863)
Additions to capitalized software			(3,306)	(1,792)
Purchase of long-term investment			(1,000)
Net cash used in investing activities			(335,410)	(15,405)
Cash Flow from Financing Activities:
Repayments of debt			(155,325)	(174,000)
Transactions involving Holding's common stock			13,556	710,565
Payment of fees related to refinancing activities			(222)
Net cash (used in) provided by financing activities			(141,991)	536,565
Effect of exchange rate changes on cash and cash equivalents			(872)	(1,651)
Net (decrease) increase in cash and cash equivalents			(338,937)	620,231
Cash and cash equivalents, beginning of period	95,222		434,159	109,577
Cash and cash equivalents, end of period	95,222	729,808	95,222	729,808
Parent Company [Member]
Supplemental Guarantor Financial Statements [Line Items]
Investment in subsidiaries					2,798,897	2,722,452
Total assets					2,798,897	2,722,452
Accrued expenses					16,157	17,006
Long-term debt, net of current portion (Note 2)					600,000	600,000
Intercompany payables					18,310
Total liabilities					634,467	617,006
Total stockholders’ equity					2,164,430	2,105,446
Total liabilities and stockholders’ equity					2,798,897	2,722,452
Operating expenses:
Interest expense, net	(8,813)		(17,461)
Earnings from subsidiaries	37,034	39,128	52,687	65,374
Income before income taxes	28,221	39,128	35,226	65,374
Net income	28,221	39,128	35,226	65,374
Other comprehensive income (loss), net of tax:
Foreign currency exchange translation adjustment	(26,793)	22,808	(17,472)	(13,411)
Comprehensive income	1,428	61,936	17,754	51,963
Cash Flow from Operating Activities:
Net income	28,221	39,128	35,226	65,374
Intercompany transactions			18,310
Earnings from subsidiaries	(37,034)	(39,128)	(52,687)	(65,374)
Changes in operating assets and liabilities			(849)
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Statements [Line Items]
Cash and cash equivalents	24,753	657,564	24,753	34,651	24,753	360,583
Accounts receivable, net					176,884	127,446
Prepaid expenses and other current assets					21,254	15,920
Prepaid income taxes					41,256	38,155
Restricted cash					2,490	2,490
Net property, plant and equipment					30,704	31,940
Investment in subsidiaries					764,004	654,278
Intercompany receivables					136,630	100,992
Goodwill, intangible and other assets, net					3,966,829	3,861,711
Total assets					5,164,804	5,193,515
Less current portion of long-term debt					16,166	17,243
Accounts payable					13,028	7,367
Accrued expenses					71,968	84,174
Deferred revenue					214,246	202,252
Long-term debt, net of current portion (Note 2)					1,535,644	1,646,396
Other long-term liabilities					40,020	31,748
Intercompany payables					47,769	34,220
Deferred income taxes, long-term					427,066	447,663
Total liabilities					2,365,907	2,471,063
Total stockholders’ equity					2,798,897	2,722,452
Total liabilities and stockholders’ equity					5,164,804	5,193,515
Revenues	257,316	110,497	476,305	216,325
Cost of revenues	138,262	51,035	251,764	101,075
Gross profit	119,054	59,462	224,541	115,250
Operating expenses:
Selling and marketing	21,118	8,708	43,865	17,068
Research and development	28,853	9,433	54,218	18,730
General and administrative	18,602	8,904	41,081	20,412
Total operating expenses	68,573	27,045	139,164	56,210
Operating income	50,481	32,417	85,377	59,040
Interest expense, net	(17,548)	(2,570)	(35,466)	(5,323)
Other (expense) income, net	(17,617)	1,431	(32,017)	1,103
Earnings from subsidiaries	23,523	10,475	41,360	26,952
Income before income taxes	38,839	41,753	59,254	81,772
Provision for income taxes	1,805	2,625	6,567	16,398
Net income	37,034	39,128	52,687	65,374
Other comprehensive income (loss), net of tax:
Foreign currency exchange translation adjustment	(26,793)	22,808	(17,472)	(13,411)
Comprehensive income	10,241	61,936	35,215	51,963
Cash Flow from Operating Activities:
Net income	37,034	39,128	52,687	65,374
Non-cash adjustments			70,450	17,672
Intercompany transactions			(11,902)	10,748
Earnings from subsidiaries	(23,523)	(10,475)	(41,360)	(26,952)
Changes in operating assets and liabilities			14,399	(14,563)
Net cash provided by operating activities			84,274	52,279
Cash Flow from Investment Activities:
Additions to property and equipment			(5,080)	(2,532)
Proceeds from sale of property and equipment			95
Cash paid for business acquisitions, net of cash acquired			(219,276)
Additions to capitalized software			(1,879)	(380)
Purchase of long-term investment			(1,000)
Net cash used in investing activities			(227,140)	(2,912)
Cash Flow from Financing Activities:
Repayments of debt			(115,500)	(137,019)
Transactions involving Holding's common stock			13,556	710,565
Intercompany transactions			(90,798)
Payment of fees related to refinancing activities			(222)
Net cash (used in) provided by financing activities			(192,964)	573,546
Net (decrease) increase in cash and cash equivalents			(335,830)	622,913
Cash and cash equivalents, beginning of period			360,583	34,651
Cash and cash equivalents, end of period	24,753	657,564	24,753	657,564
Non-guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Statements [Line Items]
Cash and cash equivalents	70,469	72,244	70,469	74,926	70,469	73,576
Accounts receivable, net					62,544	42,505
Prepaid expenses and other current assets					11,344	11,591
Prepaid income taxes						2,472
Restricted cash					328	328
Net property, plant and equipment					38,853	35,203
Intercompany receivables					47,768	34,220
Deferred income taxes, long-term					2,018	2,199
Goodwill, intangible and other assets, net					1,241,050	1,196,123
Total assets					1,474,374	1,398,217
Less current portion of long-term debt					14,712	15,038
Accounts payable					7,005	4,590
Accrued expenses					36,061	47,848
Income taxes payable					1,937	1,428
Deferred revenue					24,539	19,772
Long-term debt, net of current portion (Note 2)					434,327	472,674
Other long-term liabilities					21,895	19,686
Intercompany payables					118,319	100,992
Deferred income taxes, long-term					51,575	61,911
Total liabilities					710,370	743,939
Total stockholders’ equity					764,004	654,278
Total liabilities and stockholders’ equity					1,474,374	1,398,217
Revenues	116,184	102,655	221,768	202,979
Cost of revenues	72,640	58,852	136,264	121,536
Gross profit	43,544	43,803	85,504	81,443
Operating expenses:
Selling and marketing	7,417	5,223	14,531	10,250
Research and development	11,974	8,087	23,056	18,398
General and administrative	8,597	4,559	16,813	10,351
Total operating expenses	27,988	17,869	54,400	38,999
Operating income	15,556	25,934	31,104	42,444
Interest expense, net	(6,485)	(2,849)	(13,008)	(5,696)
Other (expense) income, net	17,629	(1,595)	30,182	(2,774)
Income before income taxes	26,700	21,490	48,278	33,974
Provision for income taxes	3,177	11,015	6,918	7,022
Net income	23,523	10,475	41,360	26,952
Other comprehensive income (loss), net of tax:
Foreign currency exchange translation adjustment	(27,221)	21,614	(22,449)	(7,601)
Comprehensive income	(3,698)	32,089	18,911	19,351
Cash Flow from Operating Activities:
Net income	23,523	10,475	41,360	26,952
Non-cash adjustments			29,806	33,667
Intercompany transactions			(6,408)	(10,748)
Changes in operating assets and liabilities			(9,696)	(1,428)
Net cash provided by operating activities			55,062	48,443
Cash Flow from Investment Activities:
Additions to property and equipment			(8,513)	(3,218)
Proceeds from sale of property and equipment			(52)
Cash paid for business acquisitions, net of cash acquired			(98,278)	(7,863)
Additions to capitalized software			(1,427)	(1,412)
Net cash used in investing activities			(108,270)	(12,493)
Cash Flow from Financing Activities:
Repayments of debt			(39,825)	(36,981)
Intercompany transactions			90,798
Net cash (used in) provided by financing activities			50,973	(36,981)
Effect of exchange rate changes on cash and cash equivalents			(872)	(1,651)
Net (decrease) increase in cash and cash equivalents			(3,107)	(2,682)
Cash and cash equivalents, beginning of period			73,576	74,926
Cash and cash equivalents, end of period	70,469	72,244	70,469	72,244
Consolidation, Eliminations [Member]
Supplemental Guarantor Financial Statements [Line Items]
Prepaid income taxes					(1,937)
Investment in subsidiaries					(3,562,901)	(3,376,730)
Intercompany receivables					(184,398)	(135,212)
Total assets					(3,749,236)	(3,511,942)
Income taxes payable					(1,937)
Intercompany payables					(184,398)	(135,212)
Total liabilities					(186,335)	(135,212)
Total stockholders’ equity					(3,562,901)	(3,376,730)
Total liabilities and stockholders’ equity					$ (3,749,236)	$ (3,511,942)
Revenues	(423)	(384)	(865)	(801)
Cost of revenues	(423)	(384)	(865)	(801)
Operating expenses:
Earnings from subsidiaries	(60,557)	(49,603)	(94,047)	(92,326)
Income before income taxes	(60,557)	(49,603)	(94,047)	(92,326)
Net income	(60,557)	(49,603)	(94,047)	(92,326)
Other comprehensive income (loss), net of tax:
Foreign currency exchange translation adjustment	54,014	(44,422)	39,921	21,012
Comprehensive income	(6,543)	(94,025)	(54,126)	(71,314)
Cash Flow from Operating Activities:
Net income	(60,557)	(49,603)	(94,047)	(92,326)
Earnings from subsidiaries	$ 60,557	$ 49,603	$ 94,047	$ 92,326