Condensed Consolidated Statement of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statement of Income and Comprehensive Income [Abstract]
Revenue	$ 816,786	$ 690,932	$ 1,543,537	$ 1,331,535
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Food, beverage and packaging	270,510	221,517	510,099	428,107
Labor	185,804	159,895	357,273	311,880
Occupancy	48,564	41,758	96,184	82,267
Other operating costs	86,296	66,353	162,952	132,532
General and administrative expenses	50,952	42,295	95,163	91,629
Depreciation and amortization	23,597	20,543	46,533	40,627
Pre-opening costs	3,246	3,306	6,132	5,754
Loss on disposal of assets	1,399	1,475	2,739	2,725
Total operating expenses	670,368	557,142	1,277,075	1,095,521
Income from operations	146,418	133,790	266,462	236,014
Interest and other income, net	330	377	596	811
Income before income taxes	146,748	134,167	267,058	236,825
Provision for income taxes	(58,895)	(52,484)	(102,621)	(92,478)
Net income	87,853	81,683	164,437	144,347
Earnings per share
Basic	$ 2.84	$ 2.58	$ 5.31	$ 4.57
Diluted	$ 2.82	$ 2.56	$ 5.27	$ 4.53
Weighted average common shares outstanding
Basic	30,901	31,696	30,956	31,553
Diluted	31,176	31,951	31,202	31,899
Comprehensive income	$ 87,820	$ 80,625	$ 163,300	$ 143,972