Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 433,391		$ 331,761
Receivables, net	1,223,197		1,154,083
Intercompany receivables, net	0		0
Inventories	2,582,188		2,836,075
Prepaid expenses and other current assets	245,082		199,030
Total current assets	4,483,858		4,520,949
Property, plant and equipment, net	1,184,188		1,220,162
Operating lease assets, net	1,303,260		0
Intangible assets:
Goodwill	4,309,822		4,381,458
Other intangibles, net	837,272		928,752
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	144,009		179,169
Other noncurrent assets	149,281		162,912
Total assets	12,411,690		11,393,402
Current liabilities:
Accounts payable	997,874		942,398
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	162,152		172,005
Other accrued expenses	326,634		288,425
Refund liability	100,327		104,585
Other current liabilities	113,349		61,109
Current portion of operating lease liabilities	225,572		0
Current portion of long-term obligations	128,143		121,826
Total current liabilities	2,054,051		1,690,348
Long-term operating lease liabilities, excluding current portion	1,129,423		0
Long-term obligations, excluding current portion	3,737,112		4,188,674
Intercompany notes payable	0		0
Deferred income taxes	296,199		311,434
Other noncurrent liabilities	322,205		364,194
Total Company stockholders' equity	4,817,767		4,782,298
Noncontrolling interest	54,933		56,454
Total stockholders' equity	4,872,700	$ 4,909,748	4,838,752	$ 4,897,416	$ 4,776,975	$ 4,206,653
Total liabilities and stockholders' equity	12,411,690		11,393,402
Parent
Current assets:
Cash and cash equivalents	141,555		25,633
Receivables, net	0		310
Intercompany receivables, net	9,473		6,978
Inventories	0		0
Prepaid expenses and other current assets	6,347		18,611
Total current assets	157,375		51,532
Property, plant and equipment, net	459		1,547
Operating lease assets, net	3,754
Intangible assets:
Goodwill	0		0
Other intangibles, net	629		260
Investment in subsidiaries	5,250,321		5,224,006
Intercompany notes receivable	1,118,688		1,220,582
Equity method investments	0		0
Other noncurrent assets	65,679		70,283
Total assets	6,596,905		6,568,210
Current liabilities:
Accounts payable	2,802		2,454
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	6,911		6,652
Other accrued expenses	14,965		5,454
Refund liability	0		0
Other current liabilities	5,520		283
Current portion of operating lease liabilities	217
Current portion of long-term obligations	15,029		8,459
Total current liabilities	45,444		23,302
Long-term operating lease liabilities, excluding current portion	3,943
Long-term obligations, excluding current portion	1,613,249		1,628,677
Intercompany notes payable	0		0
Deferred income taxes	5,032		8,045
Other noncurrent liabilities	111,470		125,888
Total Company stockholders' equity	4,817,767		4,782,298
Noncontrolling interest	0		0
Total stockholders' equity	4,817,767		4,782,298
Total liabilities and stockholders' equity	6,596,905		6,568,210
Guarantors
Current assets:
Cash and cash equivalents	31,533		29,285
Receivables, net	337,543		316,726
Intercompany receivables, net	0		0
Inventories	1,228,576		1,343,612
Prepaid expenses and other current assets	95,389		99,356
Total current assets	1,693,041		1,788,979
Property, plant and equipment, net	612,127		600,054
Operating lease assets, net	854,956
Intangible assets:
Goodwill	2,001,356		1,973,364
Other intangibles, net	254,255		272,451
Investment in subsidiaries	127,820		111,826
Intercompany notes receivable	108,071		10,515
Equity method investments	17,275		16,404
Other noncurrent assets	40,503		40,548
Total assets	5,709,404		4,814,141
Current liabilities:
Accounts payable	346,907		343,116
Intercompany payables, net	27,939		12,880
Accrued expenses:
Accrued payroll-related liabilities	55,803		70,267
Other accrued expenses	115,571		105,672
Refund liability	49,526		50,899
Other current liabilities	22,723		17,860
Current portion of operating lease liabilities	131,719
Current portion of long-term obligations	2,936		2,932
Total current liabilities	753,124		603,626
Long-term operating lease liabilities, excluding current portion	756,450
Long-term obligations, excluding current portion	15,533		13,532
Intercompany notes payable	537,341		597,283
Deferred income taxes	139,482		135,355
Other noncurrent liabilities	82,835		99,147
Total Company stockholders' equity	3,424,639		3,365,198
Noncontrolling interest	0		0
Total stockholders' equity	3,424,639		3,365,198
Total liabilities and stockholders' equity	5,709,404		4,814,141
Non-Guarantors
Current assets:
Cash and cash equivalents	260,303		276,843
Receivables, net	885,654		837,047
Intercompany receivables, net	27,939		12,880
Inventories	1,353,612		1,492,463
Prepaid expenses and other current assets	143,346		81,063
Total current assets	2,670,854		2,700,296
Property, plant and equipment, net	571,602		618,561
Operating lease assets, net	444,550
Intangible assets:
Goodwill	2,308,466		2,408,094
Other intangibles, net	582,388		656,041
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	126,734		162,765
Other noncurrent assets	43,099		52,081
Total assets	6,747,693		6,597,838
Current liabilities:
Accounts payable	648,165		596,828
Intercompany payables, net	9,473		6,978
Accrued expenses:
Accrued payroll-related liabilities	99,438		95,086
Other accrued expenses	196,098		177,299
Refund liability	50,801		53,686
Other current liabilities	85,106		42,966
Current portion of operating lease liabilities	93,636
Current portion of long-term obligations	110,178		110,435
Total current liabilities	1,292,895		1,083,278
Long-term operating lease liabilities, excluding current portion	369,030
Long-term obligations, excluding current portion	2,108,330		2,546,465
Intercompany notes payable	689,418		633,814
Deferred income taxes	151,685		168,034
Other noncurrent liabilities	127,900		139,159
Total Company stockholders' equity	1,953,502		1,970,634
Noncontrolling interest	54,933		56,454
Total stockholders' equity	2,008,435		2,027,088
Total liabilities and stockholders' equity	6,747,693		6,597,838
Eliminations
Current assets:
Cash and cash equivalents	0		0
Receivables, net	0		0
Intercompany receivables, net	(37,412)		(19,858)
Inventories	0		0
Prepaid expenses and other current assets	0		0
Total current assets	(37,412)		(19,858)
Property, plant and equipment, net	0		0
Operating lease assets, net	0
Intangible assets:
Goodwill	0		0
Other intangibles, net	0		0
Investment in subsidiaries	(5,378,141)		(5,335,832)
Intercompany notes receivable	(1,226,759)		(1,231,097)
Equity method investments	0		0
Other noncurrent assets	0		0
Total assets	(6,642,312)		(6,586,787)
Current liabilities:
Accounts payable	0		0
Intercompany payables, net	(37,412)		(19,858)
Accrued expenses:
Accrued payroll-related liabilities	0		0
Other accrued expenses	0		0
Refund liability	0		0
Other current liabilities	0		0
Current portion of operating lease liabilities	0
Current portion of long-term obligations	0		0
Total current liabilities	(37,412)		(19,858)
Long-term operating lease liabilities, excluding current portion	0
Long-term obligations, excluding current portion	0		0
Intercompany notes payable	(1,226,759)		(1,231,097)
Deferred income taxes	0		0
Other noncurrent liabilities	0		0
Total Company stockholders' equity	(5,378,141)		(5,335,832)
Noncontrolling interest	0		0
Total stockholders' equity	(5,378,141)		(5,335,832)
Total liabilities and stockholders' equity	$ (6,642,312)		$ (6,586,787)