Pro Forma Consolidated Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Acquisition [Abstract]
Sales, As reported	$ 749,442	$ 717,282	$ 681,561	$ 898,206	$ 653,566	$ 675,369	$ 642,596	$ 801,825	$ 3,046,491	$ 2,773,356	$ 2,573,769
Sales, Pro forma									3,146,011	2,995,233	2,783,120
Net income, As reported	38,567	31,231	28,380	37,943	23,038	31,019	28,210	41,161	136,121	123,428	137,047
Net income, Pro forma									$ 136,714	$ 128,022	$ 137,113
Basic net income per common share, As reported	$ 0.28	$ 0.23	$ 0.21	$ 0.28	$ 0.17	$ 0.23	$ 0.21	$ 0.31	$ 1.00	$ 0.91	$ 1.00
Basic net income per common share, Pro forma									$ 0.98	$ 0.93	$ 1.00
Diluted net income per common share, As reported	$ 0.28	$ 0.22	$ 0.21	$ 0.28	$ 0.17	$ 0.23	$ 0.21	$ 0.30	$ 0.98	$ 0.90	$ 0.99
Diluted net income per common share, Pro forma									$ 0.97	$ 0.92	$ 0.99