Condensed consolidating guarantor financial information - balance sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 303,236	$ 431,984	$ 337,039	$ 584,088
Accounts receivable, net	273,704	295,290
Accounts receivable from consolidated subsidiaries	0	0
Inventories, net	335,593	333,621
Prepaid expenses and other current assets	35,697	39,810
Prepaid taxes	40,256	36,504
Deferred tax assets	57,301	52,917
Assets held for sale	7,422	10,428
Total current assets	1,053,209	1,200,554
Property, plant and equipment, net	317,435	325,900	297,945
Goodwill	1,323,553	1,354,203	1,238,452
Intangibles assets, net	1,216,720	1,255,597
Investments in affiliates	1,150	1,715
Deferred tax assets	1,178	943
Notes receivable and other amounts due from consolidated subsidiaries	0	0
Other assets	64,010	70,095
Total assets	3,977,255	4,209,007
Current liabilities
Current borrowings	368,401	356,287
Accounts payable	64,100	71,967
Accounts payable to consolidated subsidiaries	0	0
Accrued expenses	72,383	74,868
Current portion of contingent consideration	11,276	4,131
Payroll and benefit-related liabilities	85,442	73,090
Accrued interest	9,169	8,725
Income taxes payable	13,768	23,821
Other current liabilities	10,360	22,231
Total current liabilities	634,899	635,120
Long-term borrowings	700,000	930,000
Deferred tax liabilities	451,541	514,715
Pension and other postretirement benefit liabilities	167,241	109,498
Noncurrent liability for uncertain tax positions	50,884	55,152
Notes payable and other amounts due to consolidated subsidiaries	0	0
Other liabilities	58,991	48,506
Total liabilities	2,063,556	2,292,991
Total common shareholders’ equity	1,911,309	1,913,527
Noncontrolling interest	2,390	2,489
Total equity	1,913,699	1,916,016	1,781,537	1,982,783
Total liabilities and equity	3,977,255	4,209,007
Eliminations
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	3,855	3,472
Accounts receivable from consolidated subsidiaries	(2,613,473)	(2,880,648)
Inventories, net	(23,286)	(15,709)
Prepaid expenses and other current assets	0	0
Prepaid taxes	0	0
Deferred tax assets	0	(3)
Assets held for sale	0	0
Total current assets	(2,632,904)	(2,892,888)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles assets, net	0	0
Investments in affiliates	(7,042,537)	(6,987,772)
Deferred tax assets	(56,601)	(39,410)
Notes receivable and other amounts due from consolidated subsidiaries	(2,515,853)	(1,936,618)
Other assets	0	0
Total assets	(12,247,895)	(11,856,688)
Current liabilities
Current borrowings	0	0
Accounts payable	0	0
Accounts payable to consolidated subsidiaries	(2,612,090)	(2,880,648)
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	(4)
Total current liabilities	(2,612,090)	(2,880,652)
Long-term borrowings	0	0
Deferred tax liabilities	(56,600)	(39,409)
Pension and other postretirement benefit liabilities	0	0
Noncurrent liability for uncertain tax positions	0	0
Notes payable and other amounts due to consolidated subsidiaries	(2,520,610)	(1,940,100)
Other liabilities	0	0
Total liabilities	(5,189,300)	(4,860,161)
Total common shareholders’ equity	(7,058,595)	(6,996,527)
Noncontrolling interest	0	0
Total equity	(7,058,595)	(6,996,527)
Total liabilities and equity	(12,247,895)	(11,856,688)
Parent Company
Current assets
Cash and cash equivalents	27,996	42,749	70,860	114,531
Accounts receivable, net	2,346	1,822
Accounts receivable from consolidated subsidiaries	37,378	42,865
Inventories, net	0	0
Prepaid expenses and other current assets	14,301	15,200
Prepaid taxes	23,493	27,487
Deferred tax assets	30,248	20,218
Assets held for sale	2,901	1,669
Total current assets	138,663	152,010
Property, plant and equipment, net	3,489	14,189
Goodwill	0	0
Intangibles assets, net	0	0
Investments in affiliates	5,662,773	5,489,676
Deferred tax assets	52,244	35,877
Notes receivable and other amounts due from consolidated subsidiaries	1,025,859	1,049,344
Other assets	27,999	24,574
Total assets	6,911,027	6,765,670
Current liabilities
Current borrowings	363,701	351,587
Accounts payable	1,449	2,194
Accounts payable to consolidated subsidiaries	2,259,891	2,644,296
Accrued expenses	17,149	15,569
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	20,693	15,976
Accrued interest	9,152	8,720
Income taxes payable	0	0
Other current liabilities	5	9,646
Total current liabilities	2,672,040	3,047,988
Long-term borrowings	700,000	930,000
Deferred tax liabilities	0	0
Pension and other postretirement benefit liabilities	110,830	57,406
Noncurrent liability for uncertain tax positions	11,431	11,389
Notes payable and other amounts due to consolidated subsidiaries	1,483,984	785,476
Other liabilities	21,433	19,884
Total liabilities	4,999,718	4,852,143
Total common shareholders’ equity	1,911,309	1,913,527
Noncontrolling interest	0	0
Total equity	1,911,309	1,913,527
Total liabilities and equity	6,911,027	6,765,670
Guarantor Subsidiaries
Current assets
Cash and cash equivalents	0	14,500	1,989	0
Accounts receivable, net	2,422	10,948
Accounts receivable from consolidated subsidiaries	2,303,284	2,623,314
Inventories, net	204,335	211,165
Prepaid expenses and other current assets	4,786	6,870
Prepaid taxes	0	0
Deferred tax assets	17,387	22,472
Assets held for sale	0	3,503
Total current assets	2,532,214	2,892,772
Property, plant and equipment, net	170,054	188,455
Goodwill	703,663	797,671
Intangibles assets, net	743,222	962,243
Investments in affiliates	1,359,661	1,478,429
Deferred tax assets	0	0
Notes receivable and other amounts due from consolidated subsidiaries	1,489,994	873,105
Other assets	6,801	7,447
Total assets	7,005,609	7,200,122
Current liabilities
Current borrowings	0	0
Accounts payable	32,692	45,802
Accounts payable to consolidated subsidiaries	188,908	147,957
Accrued expenses	21,479	21,120
Current portion of contingent consideration	11,276	4,131
Payroll and benefit-related liabilities	27,228	21,818
Accrued interest	0	0
Income taxes payable	0	0
Other current liabilities	3,065	7,517
Total current liabilities	284,648	248,345
Long-term borrowings	0	0
Deferred tax liabilities	462,274	496,228
Pension and other postretirement benefit liabilities	35,074	33,777
Noncurrent liability for uncertain tax positions	15,569	17,241
Notes payable and other amounts due to consolidated subsidiaries	932,718	957,451
Other liabilities	24,900	16,221
Total liabilities	1,755,183	1,769,263
Total common shareholders’ equity	5,250,426	5,430,859
Noncontrolling interest	0	0
Total equity	5,250,426	5,430,859
Total liabilities and equity	7,005,609	7,200,122
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	275,240	374,735	264,190	469,557
Accounts receivable, net	265,081	279,048
Accounts receivable from consolidated subsidiaries	272,811	214,469
Inventories, net	154,544	138,165
Prepaid expenses and other current assets	16,610	17,740
Prepaid taxes	16,763	9,017
Deferred tax assets	9,666	10,230
Assets held for sale	4,521	5,256
Total current assets	1,015,236	1,048,660
Property, plant and equipment, net	143,892	123,256
Goodwill	619,890	556,532
Intangibles assets, net	473,498	293,354
Investments in affiliates	21,253	21,382
Deferred tax assets	5,535	4,476
Notes receivable and other amounts due from consolidated subsidiaries	0	14,169
Other assets	29,210	38,074
Total assets	2,308,514	2,099,903
Current liabilities
Current borrowings	4,700	4,700
Accounts payable	29,959	23,971
Accounts payable to consolidated subsidiaries	163,291	88,395
Accrued expenses	33,755	38,179
Current portion of contingent consideration	0	0
Payroll and benefit-related liabilities	37,521	35,296
Accrued interest	17	5
Income taxes payable	13,768	23,821
Other current liabilities	7,290	5,072
Total current liabilities	290,301	219,439
Long-term borrowings	0	0
Deferred tax liabilities	45,867	57,896
Pension and other postretirement benefit liabilities	21,337	18,315
Noncurrent liability for uncertain tax positions	23,884	26,522
Notes payable and other amounts due to consolidated subsidiaries	103,908	197,173
Other liabilities	12,658	12,401
Total liabilities	497,955	531,746
Total common shareholders’ equity	1,808,169	1,565,668
Noncontrolling interest	2,390	2,489
Total equity	1,810,559	1,568,157
Total liabilities and equity	$ 2,308,514	$ 2,099,903