Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 375,967		$ 331,761
Receivables, net	1,285,802		1,154,083
Intercompany receivables, net	0		0
Inventories	2,650,138		2,836,075
Prepaid expenses and other current assets	319,942		199,030
Total current assets	4,631,849		4,520,949
Property, plant and equipment, net	1,206,690		1,220,162
Operating lease assets, net	1,294,541		0
Intangible assets:
Goodwill	4,409,925		4,381,458
Other intangibles, net	880,123		928,752
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	133,154		179,169
Other noncurrent assets	147,954		162,912
Total assets	12,704,236		11,393,402
Current liabilities:
Accounts payable	1,031,952		942,398
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	171,650		172,005
Other accrued expenses	309,734		288,425
Refund liability	106,612		104,585
Other current liabilities	134,855		61,109
Current portion of operating lease liabilities	219,502		0
Current portion of long-term obligations	132,641		121,826
Total current liabilities	2,106,946		1,690,348
Long-term operating lease liabilities, excluding current portion	1,122,276		0
Long-term obligations, excluding current portion	3,919,902		4,188,674
Intercompany notes payable	0		0
Deferred income taxes	303,179		311,434
Other noncurrent liabilities	342,185		364,194
Total Company stockholders' equity	4,840,489		4,782,298
Noncontrolling interest	69,259		56,454
Total stockholders' equity	4,909,748	$ 4,856,774	4,838,752	$ 4,776,975	$ 4,418,981	$ 4,206,653
Total liabilities and stockholders' equity	12,704,236		11,393,402
Parent
Current assets:
Cash and cash equivalents	59,244		25,633
Receivables, net	562		310
Intercompany receivables, net	8,116		6,978
Inventories	0		0
Prepaid expenses and other current assets	13,563		18,611
Total current assets	81,485		51,532
Property, plant and equipment, net	1,067		1,547
Operating lease assets, net	3,806
Intangible assets:
Goodwill	0		0
Other intangibles, net	208		260
Investment in subsidiaries	5,323,410		5,224,006
Intercompany notes receivable	1,167,714		1,220,582
Equity method investments	0		0
Other noncurrent assets	64,026		70,283
Total assets	6,641,716		6,568,210
Current liabilities:
Accounts payable	2,120		2,454
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	6,405		6,652
Other accrued expenses	5,167		5,454
Refund liability	0		0
Other current liabilities	282		283
Current portion of operating lease liabilities	210
Current portion of long-term obligations	14,510		8,459
Total current liabilities	28,694		23,302
Long-term operating lease liabilities, excluding current portion	4,000
Long-term obligations, excluding current portion	1,636,839		1,628,677
Intercompany notes payable	0		0
Deferred income taxes	5,432		8,045
Other noncurrent liabilities	126,262		125,888
Total Company stockholders' equity	4,840,489		4,782,298
Noncontrolling interest	0		0
Total stockholders' equity	4,840,489		4,782,298
Total liabilities and stockholders' equity	6,641,716		6,568,210
Guarantors
Current assets:
Cash and cash equivalents	42,654		29,285
Receivables, net	362,043		316,726
Intercompany receivables, net	0		0
Inventories	1,239,102		1,343,612
Prepaid expenses and other current assets	134,382		99,356
Total current assets	1,778,181		1,788,979
Property, plant and equipment, net	605,005		600,054
Operating lease assets, net	818,994
Intangible assets:
Goodwill	2,004,702		1,973,364
Other intangibles, net	257,517		272,451
Investment in subsidiaries	125,028		111,826
Intercompany notes receivable	117,962		10,515
Equity method investments	16,882		16,404
Other noncurrent assets	40,146		40,548
Total assets	5,764,417		4,814,141
Current liabilities:
Accounts payable	386,282		343,116
Intercompany payables, net	28,079		12,880
Accrued expenses:
Accrued payroll-related liabilities	60,151		70,267
Other accrued expenses	113,832		105,672
Refund liability	51,875		50,899
Other current liabilities	27,576		17,860
Current portion of operating lease liabilities	119,744
Current portion of long-term obligations	3,311		2,932
Total current liabilities	790,850		603,626
Long-term operating lease liabilities, excluding current portion	727,838
Long-term obligations, excluding current portion	16,242		13,532
Intercompany notes payable	557,324		597,283
Deferred income taxes	135,283		135,355
Other noncurrent liabilities	79,658		99,147
Total Company stockholders' equity	3,457,222		3,365,198
Noncontrolling interest	0		0
Total stockholders' equity	3,457,222		3,365,198
Total liabilities and stockholders' equity	5,764,417		4,814,141
Non-Guarantors
Current assets:
Cash and cash equivalents	274,069		276,843
Receivables, net	923,197		837,047
Intercompany receivables, net	28,079		12,880
Inventories	1,411,036		1,492,463
Prepaid expenses and other current assets	171,997		81,063
Total current assets	2,808,378		2,700,296
Property, plant and equipment, net	600,618		618,561
Operating lease assets, net	471,741
Intangible assets:
Goodwill	2,405,223		2,408,094
Other intangibles, net	622,398		656,041
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	116,272		162,765
Other noncurrent assets	43,782		52,081
Total assets	7,068,412		6,597,838
Current liabilities:
Accounts payable	643,550		596,828
Intercompany payables, net	8,116		6,978
Accrued expenses:
Accrued payroll-related liabilities	105,094		95,086
Other accrued expenses	190,735		177,299
Refund liability	54,737		53,686
Other current liabilities	106,997		42,966
Current portion of operating lease liabilities	99,548
Current portion of long-term obligations	114,820		110,435
Total current liabilities	1,323,597		1,083,278
Long-term operating lease liabilities, excluding current portion	390,438
Long-term obligations, excluding current portion	2,266,821		2,546,465
Intercompany notes payable	728,352		633,814
Deferred income taxes	162,464		168,034
Other noncurrent liabilities	136,265		139,159
Total Company stockholders' equity	1,991,216		1,970,634
Noncontrolling interest	69,259		56,454
Total stockholders' equity	2,060,475		2,027,088
Total liabilities and stockholders' equity	7,068,412		6,597,838
Eliminations
Current assets:
Cash and cash equivalents	0		0
Receivables, net	0		0
Intercompany receivables, net	(36,195)		(19,858)
Inventories	0		0
Prepaid expenses and other current assets	0		0
Total current assets	(36,195)		(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	(5,448,438)		(5,335,832)
Intercompany notes receivable	(1,285,676)		(1,231,097)
Equity method investments	0		0
Other noncurrent assets	0		0
Total assets	(6,770,309)		(6,586,787)
Current liabilities:
Accounts payable	0		0
Intercompany payables, net	(36,195)		(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	(36,195)		(19,858)
Long-term operating lease liabilities, excluding current portion	0
Long-term obligations, excluding current portion	0		0
Intercompany notes payable	(1,285,676)		(1,231,097)
Deferred income taxes	0		0
Other noncurrent liabilities	0		0
Total Company stockholders' equity	(5,448,438)		(5,335,832)
Noncontrolling interest	0		0
Total stockholders' equity	(5,448,438)		(5,335,832)
Total liabilities and stockholders' equity	$ (6,770,309)		$ (6,586,787)