Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Deferred Income Taxes and Tax Credits [Abstract]

Schedule of deferred tax assets and liabilities

	December 31,
	2013			2012
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	1,997		$	1,937
Tax credits	1,636			1,583
Other accruals	61,100			55,683
Total current deferred tax assets	64,733			59,203
Noncurrent:
Tax credits	5,333			5,333
Net operating losses	1,180			2,077
Other accruals	59,176			58,605
Total noncurrent deferred tax assets	65,689			66,015
Total deferred tax assets	130,422			125,218
Deferred tax liabilities:
Current:
Inventories	84,955			78,675
Total current deferred tax liabilities	84,955			78,675
Noncurrent:
Property and equipment	131,851			132,547
Other	14,551			13,012
Total noncurrent deferred tax liabilities	146,402			145,559
Total deferred tax liabilities	231,357			224,234
Net deferred tax liabilities	$	(100,935	)	$	(99,016	)

Reconciliation of net deferred tax assets (liabilities)

	December 31,
	2013			2012
Deferred tax assets - current	$	64,733		$	59,203
Deferred tax liabilities - current	(84,955		)	(78,675		)
Deferred tax liabilities - current	$	(20,222	)	$	(19,472	)
Deferred tax assets - noncurrent	65,689			66,015
Deferred tax liabilities - noncurrent	(146,402		)	(145,559		)
Deferred tax liabilities - noncurrent	$	(80,713	)	$	(79,544	)
Net deferred tax liabilities	$	(100,935	)	$	(99,016	)

Schedule of components of the provision for income taxes

	Current		Deferred			Total
2013
Federal	$	348,303	$	847		$	349,150
State	38,428		1,072			39,500
	$	386,731	$	1,919		$	388,650
2012
Federal	$	311,631	$	10,030		$	321,661
State	35,982		(1,868		)	34,114
	$	347,613	$	8,162		$	355,775
2011
Federal	$	228,443	$	55,175		$	283,618
State	25,537		(1,055		)	24,482
	$	253,980	$	54,120		$	308,100

Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate

	For the Year Ended December 31,
	2013			2012		2011
Federal income taxes at statutory rate	$	370,632		$	329,532	$	285,524
State income taxes, net of federal tax benefit	26,802			22,426		16,132
Other items, net	(8,784		)	3,817		6,444
Total provision for income taxes	$	388,650		$	355,775	$	308,100

Summary of changes in gross amount of unrecognized tax benefits, excluding interest and penalties

	For the Year Ended December 31,
	2013			2012			2011
Balance as of January 1,	$	51,004		$	45,800		$	36,710
Additions based on tax positions related to the current year	7,046			8,100			7,308
Additions based on tax positions related to prior years	—			1,301			4,060
Payments related to items settled with taxing authorities	(1,056		)	(451		)	—
Reductions due to the lapse of statute of limitations and settlements	(6,535		)	(3,746		)	(2,278		)
Balance as of December 31,	$	50,459		$	51,004		$	45,800