Quarterly Operating Results (Unaudited) - Quarterly Operating Results (unaudited) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Number of days in quarter	93 days	91 days	91 days	90 days	92 days	91 days	91 days	92 days	365 days	366 days
Revenues	$ 509,751	$ 522,478	$ 529,491	$ 507,473	$ 477,687	$ 465,234	$ 458,218	$ 439,600	$ 2,069,193	$ 1,840,739	$ 1,882,187
Gross profit	175,039	182,841	179,196	167,353	150,337	138,813	144,648	132,799	704,429	566,597	541,521
Operating income (loss)	49,174	53,935	53,913	44,240	31,603	(13,269)	53,037	37,126	201,262	108,497	165,206
Income (loss) from continuing operations	23,929	29,068	29,492	22,245	39,478	(55,686)	39,705	19,739	104,734	43,236	101,308
Income (loss) from discontinued operations, net of tax	(1,421)				2,428	7,125	2,685	4,536	(1,421)	16,774	13,037
Gain on disposal of discontinued operations, net of tax					124,697	9,783				134,480
Net income (loss)	$ 22,508	$ 29,068	$ 29,492	$ 22,245	$ 166,603	$ (38,778)	$ 42,390	$ 24,275	$ 103,313	$ 194,490	$ 114,345
Basic income (loss) per share
Continuing operations	$ 0.55	$ 0.67	$ 0.67	$ 0.50	$ 0.89	$ (1.24)	$ 0.87	$ 0.43	$ 2.39	$ 0.96	$ 2.15
Discontinued operations	$ (0.03)				$ 0.06	$ 0.15	$ 0.06	$ 0.10	$ (0.03)	$ 0.37	$ 0.28
Disposal of discontinued operations					$ 2.82	$ 0.22				$ 2.98
Net income (loss)	$ 0.52	$ 0.67	$ 0.67	$ 0.50	$ 3.77	$ (0.87)	$ 0.93	$ 0.53	$ 2.36	$ 4.31	$ 2.43
Diluted income (loss) per share
Continuing operations	$ 0.54	$ 0.65	$ 0.66	$ 0.49	$ 0.88	$ (1.24)	$ 0.86	$ 0.42	$ 2.34	$ 0.94	$ 2.11
Discontinued operations	$ (0.03)				$ 0.05	$ 0.15	$ 0.06	$ 0.10	$ (0.03)	$ 0.36	$ 0.27
Disposal of discontinued operations					$ 2.77	$ 0.22				$ 2.93
Net income (loss)	$ 0.51	$ 0.65	$ 0.66	$ 0.49	$ 3.70	$ (0.87)	$ 0.92	$ 0.52	$ 2.31	$ 4.23	$ 2.38