Supplemental Guarantor Financial Information (Condensed Consolidating Statements Of Cash Flows) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 172,135,000	$ 5,826,000	$ 218,029,000
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(153,138,000)	(85,395,000)	(75,896,000)
Capital expenditures	(79,686,000)	(71,710,000)	(30,383,000)
Proceeds from sale of assets	7,385,000	6,227,000	7,037,000
Proceeds from disposal of business, net	97,728,000	0	0
Proceeds from sale or redemption of investments	0	4,600,000	7,044,000
Investments in life insurance policies	(284,000)	(284,000)	(478,000)
Net cash provided by (used in) investing activities	(127,995,000)	(146,562,000)	(104,280,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	959,183,000	370,411,000	0
Repayments of credit facility	(885,183,000)	(310,411,000)	0
Repayments of other borrowings	(21,455,000)	(13,956,000)	(27,170,000)
Proceeds from book overdrafts	116,000	14,906,000	0
Payments of capital lease obligations	(21,060,000)	(16,458,000)	(14,460,000)
Proceeds from stock options exercises and other share-based awards	5,013,000	12,542,000	3,515,000
Excess tax benefit from stock-based compensation	759,000	7,766,000	0
Purchases of treasury stock	(75,000,000)	(75,000,000)	0
Payments of financing costs	(117,000)	(6,589,000)	(169,000)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash (used in) provided by financing activities	(37,744,000)	(16,789,000)	(24,741,000)
Net (decrease) increase and cash equivalents	6,396,000	(157,525,000)	89,008,000
Net effect of currency translation on cash	91,000	201,000	75,000
Cash and cash equivalents - beginning of period	20,280,000	177,604,000	88,521,000
Cash and cash equivalents - end of period	26,767,000	20,280,000	177,604,000
Cash and cash equivalents of discontinued operations	385,000	12,874,000	18,911,000
Cash and cash equivalents of continuing operations	26,382,000	7,406,000	158,693,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,254,000)	(939,000)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	(31,236,000)
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	(284,000)	(284,000)
Net cash provided by (used in) investing activities	(284,000)	(31,520,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock options exercises and other share-based awards	5,013,000	12,542,000
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	(75,000,000)	(75,000,000)
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	71,525,000	94,917,000
Net cash (used in) provided by financing activities	1,538,000	32,459,000
Net (decrease) increase and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	151,866,000	21,729,000
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(151,736,000)	(44,716,000)
Capital expenditures	(77,744,000)	(71,615,000)
Proceeds from sale of assets	7,385,000	5,887,000
Proceeds from disposal of business, net	97,728,000
Proceeds from sale or redemption of investments		4,600,000
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	(124,367,000)	(105,844,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	959,183,000	370,411,000
Repayments of credit facility	(885,183,000)	(310,411,000)
Repayments of other borrowings	(21,455,000)	(13,956,000)
Proceeds from book overdrafts	116,000	14,906,000
Payments of capital lease obligations	(21,034,000)	(16,422,000)
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	759,000	7,766,000
Purchases of treasury stock	0	0
Payments of financing costs	(117,000)	(6,589,000)
Net financing activities and advances (to) from consolidated affiliates	(58,181,000)	(122,573,000)
Net cash (used in) provided by financing activities	(25,912,000)	(76,868,000)
Net (decrease) increase and cash equivalents	1,587,000	(160,983,000)
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	16,240,000	177,223,000
Cash and cash equivalents - end of period	17,827,000	16,240,000
Cash and cash equivalents of discontinued operations	275,000	11,386,000
Cash and cash equivalents of continuing operations	17,552,000	4,854,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	21,523,000	(14,964,000)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(1,402,000)	(9,443,000)
Capital expenditures	(1,942,000)	(95,000)
Proceeds from sale of assets	0	340,000
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	(3,344,000)	(9,198,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	(26,000)	(36,000)
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	0	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	(13,344,000)	27,656,000
Net cash (used in) provided by financing activities	(13,370,000)	27,620,000
Net (decrease) increase and cash equivalents	4,809,000	3,458,000
Net effect of currency translation on cash	91,000	201,000
Cash and cash equivalents - beginning of period	4,040,000	381,000
Cash and cash equivalents - end of period	8,940,000	4,040,000
Cash and cash equivalents of discontinued operations	110,000	1,488,000
Cash and cash equivalents of continuing operations	8,830,000	2,552,000
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	0	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Proceeds from disposal of business, net	0
Proceeds from sale or redemption of investments		0
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	0	0
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	0	0
Repayments of credit facility	0	0
Repayments of other borrowings	0	0
Proceeds from book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	0	0
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash (used in) provided by financing activities	0	0
Net (decrease) increase and cash equivalents	0	0
Net effect of currency translation on cash	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Cash and cash equivalents of discontinued operations	0	0
Cash and cash equivalents of continuing operations	$ 0	$ 0