Condensed consolidating guarantor financial information - Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 301,083	$ 357,161
Accounts receivable, net	418,673	366,286
Accounts receivable from consolidated subsidiaries	0	0
Inventories	476,557	427,778
Prepaid expenses and other current assets	97,943	72,481
Prepaid taxes	12,076	12,463
Total current assets	1,306,332	1,236,169
Property, plant and equipment, net	430,719	432,766	$ 382,999
Operating lease assets	113,160
Goodwill	2,245,305	2,246,579	$ 2,235,592
Intangibles assets, net	2,156,285	2,325,052
Investments in affiliates	0	0
Deferred tax assets	5,572	2,446
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	52,447	34,979
Total assets	6,309,820	6,277,991
Current liabilities
Current borrowings	50,000	86,625
Accounts payable	102,916	106,709
Accounts payable to consolidated subsidiaries	0	0
Accrued expenses	100,466	97,551
Current portion of contingent consideration	148,090	136,877
Payroll and benefit-related liabilities	115,981	104,670
Accrued interest	5,514	6,031
Income taxes payable	6,692	5,943
Other current liabilities	33,396	38,050
Total current liabilities	563,055	582,456
Long-term borrowings	1,858,943	2,072,200
Deferred tax liabilities	439,558	608,221
Pension and postretirement benefit liabilities	82,719	92,914
Noncurrent liability for uncertain tax positions	10,294	10,718
Notes payable and other amounts due to consolidated subsidiaries	0	0
Noncurrent contingent consideration	71,818	167,370
Noncurrent operating lease liabilities	101,372
Other liabilities	202,741	204,134
Total liabilities	3,330,500	3,738,013
Total shareholders' equity	2,979,320	2,539,978
Total liabilities and shareholders' equity	6,309,820	6,277,991
Eliminations
Current assets
Cash and cash equivalents	0	0
Accounts receivable, net	5,657	5,334
Accounts receivable from consolidated subsidiaries	(1,029,095)	(1,520,035)
Inventories	(57,811)	(30,954)
Prepaid expenses and other current assets	8,218	4,113
Prepaid taxes	0	0
Total current assets	(1,073,031)	(1,541,542)
Property, plant and equipment, net	0	0
Operating lease assets	0
Goodwill	0	0
Intangibles assets, net	0	0
Investments in affiliates	(8,984,063)	(8,330,183)
Deferred tax assets	(17,652)	(2,376)
Notes receivable and other amounts due from consolidated subsidiaries	(6,042,904)	(5,698,794)
Other assets	0	0
Total assets	(16,117,650)	(15,572,895)
Current liabilities
Current borrowings	0	0
Accounts payable	0	0
Accounts payable to consolidated subsidiaries	(1,029,095)	(1,520,035)
Accrued expenses	0	0
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	0	0
Accrued interest	0	0
Income taxes payable	0	0
Other current liabilities	0	0
Total current liabilities	(1,029,095)	(1,520,035)
Long-term borrowings	0	0
Deferred tax liabilities	(17,652)	(2,376)
Pension and postretirement benefit liabilities	0	0
Noncurrent liability for uncertain tax positions	0	0
Notes payable and other amounts due to consolidated subsidiaries	(6,042,904)	(5,698,794)
Noncurrent contingent consideration	0	0
Noncurrent operating lease liabilities	0
Other liabilities	0	0
Total liabilities	(7,089,651)	(7,221,205)
Total shareholders' equity	(9,027,999)	(8,351,690)
Total liabilities and shareholders' equity	(16,117,650)	(15,572,895)
Parent Company
Current assets
Cash and cash equivalents	68,928	49,523
Accounts receivable, net	3,243	5,885
Accounts receivable from consolidated subsidiaries	35,629	32,036
Inventories	0	0
Prepaid expenses and other current assets	40,171	30,458
Prepaid taxes	6,371	7,029
Total current assets	154,342	124,931
Property, plant and equipment, net	2,936	3,385
Operating lease assets	12,356
Goodwill	0	0
Intangibles assets, net	70	90
Investments in affiliates	5,987,577	5,984,566
Deferred tax assets	16,345	0
Notes receivable and other amounts due from consolidated subsidiaries	2,064,309	2,337,737
Other assets	31,974	17,180
Total assets	8,269,909	8,467,889
Current liabilities
Current borrowings	0	36,625
Accounts payable	4,641	3,448
Accounts payable to consolidated subsidiaries	403,486	1,058,008
Accrued expenses	8,505	5,659
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	18,690	17,156
Accrued interest	5,482	5,995
Income taxes payable	0	0
Other current liabilities	4,224	843
Total current liabilities	445,028	1,127,734
Long-term borrowings	1,858,943	2,072,200
Deferred tax liabilities	0	87,671
Pension and postretirement benefit liabilities	38,073	49,290
Noncurrent liability for uncertain tax positions	625	801
Notes payable and other amounts due to consolidated subsidiaries	2,804,568	2,451,784
Noncurrent contingent consideration	0	0
Noncurrent operating lease liabilities	9,802
Other liabilities	133,550	138,431
Total liabilities	5,290,589	5,927,911
Total shareholders' equity	2,979,320	2,539,978
Total liabilities and shareholders' equity	8,269,909	8,467,889
Guarantor Subsidiaries
Current assets
Cash and cash equivalents	488	5,364
Accounts receivable, net	80,528	54,378
Accounts receivable from consolidated subsidiaries	492,655	1,122,107
Inventories	306,917	267,544
Prepaid expenses and other current assets	21,896	9,740
Prepaid taxes	0	0
Total current assets	902,484	1,459,133
Property, plant and equipment, net	224,176	253,913
Operating lease assets	66,388
Goodwill	1,286,372	1,284,900
Intangibles assets, net	1,291,810	1,381,285
Investments in affiliates	2,072,038	1,507,718
Deferred tax assets	0	0
Notes receivable and other amounts due from consolidated subsidiaries	3,690,788	3,347,815
Other assets	10,025	5,874
Total assets	9,544,081	9,240,638
Current liabilities
Current borrowings	0	0
Accounts payable	63,121	63,497
Accounts payable to consolidated subsidiaries	418,321	291,952
Accrued expenses	36,325	41,901
Current portion of contingent consideration	144,701	106,514
Payroll and benefit-related liabilities	50,583	45,136
Accrued interest	0	0
Income taxes payable	0	0
Other current liabilities	15,458	34,916
Total current liabilities	728,509	583,916
Long-term borrowings	0	0
Deferred tax liabilities	357,923	279,417
Pension and postretirement benefit liabilities	27,027	27,454
Noncurrent liability for uncertain tax positions	6,949	7,212
Notes payable and other amounts due to consolidated subsidiaries	1,978,067	2,222,580
Noncurrent contingent consideration	64,581	131,563
Noncurrent operating lease liabilities	65,715
Other liabilities	8,462	8,204
Total liabilities	3,237,233	3,260,346
Total shareholders' equity	6,306,848	5,980,292
Total liabilities and shareholders' equity	9,544,081	9,240,638
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	231,667	302,274
Accounts receivable, net	329,245	300,689
Accounts receivable from consolidated subsidiaries	500,811	365,892
Inventories	227,451	191,188
Prepaid expenses and other current assets	27,658	28,170
Prepaid taxes	5,705	5,434
Total current assets	1,322,537	1,193,647
Property, plant and equipment, net	203,607	175,468
Operating lease assets	34,416
Goodwill	958,933	961,679
Intangibles assets, net	864,405	943,677
Investments in affiliates	924,448	837,899
Deferred tax assets	6,879	4,822
Notes receivable and other amounts due from consolidated subsidiaries	287,807	13,242
Other assets	10,448	11,925
Total assets	4,613,480	4,142,359
Current liabilities
Current borrowings	50,000	50,000
Accounts payable	35,154	39,764
Accounts payable to consolidated subsidiaries	207,288	170,075
Accrued expenses	55,636	49,991
Current portion of contingent consideration	3,389	30,363
Payroll and benefit-related liabilities	46,708	42,378
Accrued interest	32	36
Income taxes payable	6,692	5,943
Other current liabilities	13,714	2,291
Total current liabilities	418,613	390,841
Long-term borrowings	0	0
Deferred tax liabilities	99,287	243,509
Pension and postretirement benefit liabilities	17,619	16,170
Noncurrent liability for uncertain tax positions	2,720	2,705
Notes payable and other amounts due to consolidated subsidiaries	1,260,269	1,024,430
Noncurrent contingent consideration	7,237	35,807
Noncurrent operating lease liabilities	25,855
Other liabilities	60,729	57,499
Total liabilities	1,892,329	1,770,961
Total shareholders' equity	2,721,151	2,371,398
Total liabilities and shareholders' equity	$ 4,613,480	$ 4,142,359