Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements Of Cash Flows) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net cash provided by (used in) operating activities	$ 114,670,000	$ (63,095,000)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(17,496,000)	(85,367,000)
Capital expenditures	(50,331,000)	(56,996,000)
Proceeds from sale of assets	5,808,000	4,456,000
Proceeds from disposal of business, net	97,728,000	0
Proceeds from redemption of investments	0	4,600,000
Investments in life insurance policies	(284,000)	(283,000)
Net cash provided by (used in) investing activities	35,425,000	(133,590,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	631,815,000	135,761,000
Repayments of credit facility	(681,815,000)	(108,761,000)
Repayments of other borrowings	(15,510,000)	(9,098,000)
Proceeds from (repayments of) book overdrafts	(5,645,000)	22,698,000
Payments of capital lease obligations	(14,806,000)	(12,926,000)
Proceeds from stock options exercises and other share-based awards	1,445,000	11,921,000
Excess tax benefit from stock-based compensation	302,000	3,942,000
Purchases of treasury stock	(75,000,000)	(1,950,000)
Payments of financing costs	(113,000)	(6,069,000)
Net financing activities and advances (to) from consolidated affiliates	0	0
Net cash (used in) provided by financing activities	(159,327,000)	35,518,000
Net decrease and cash equivalents	(9,232,000)	(161,167,000)
Net effect of currency translation on cash	135,000	(74,000)
Cash and cash equivalents - beginning of period	20,279,000	177,604,000
Cash and cash equivalents - end of period	11,182,000	16,363,000
Cash and cash equivalents of discontinued operations	710,000	9,079,000
Cash and cash equivalents of continuing operations	10,472,000	7,284,000
Parent Company [Member]
Net cash provided by (used in) operating activities	(891,000)	(2,436,000)
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 redemption of investments		0
Investments in life insurance policies	(284,000)	(283,000)
Net cash provided by (used in) investing activities	(284,000)	(31,519,000)
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 (repayments of) book overdrafts	0	0
Payments of capital lease obligations	0	0
Proceeds from stock options exercises and other share-based awards	1,445,000	11,921,000
Excess tax benefit from stock-based compensation	0	0
Purchases of treasury stock	(75,000,000)	(1,950,000)
Payments of financing costs	0	0
Net financing activities and advances (to) from consolidated affiliates	74,730,000	23,984,000
Net cash (used in) provided by financing activities	1,175,000	33,955,000
Net decrease 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]
Net cash provided by (used in) operating activities	96,338,000	(46,552,000)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(16,094,000)	(44,687,000)
Capital expenditures	(49,109,000)	(56,960,000)
Proceeds from sale of assets	5,808,000	4,456,000
Proceeds from disposal of business, net	97,728,000
Proceeds from redemption of investments		4,600,000
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	38,333,000	(92,591,000)
Cash flows (used in) provided by financing activities:
Proceeds from credit facility	631,815,000	135,761,000
Repayments of credit facility	(681,815,000)	(108,761,000)
Repayments of other borrowings	(15,510,000)	(9,098,000)
Proceeds from (repayments of) book overdrafts	(5,645,000)	22,698,000
Payments of capital lease obligations	(14,790,000)	(12,897,000)
Proceeds from stock options exercises and other share-based awards	0	0
Excess tax benefit from stock-based compensation	302,000	3,942,000
Purchases of treasury stock	0	0
Payments of financing costs	(113,000)	(6,069,000)
Net financing activities and advances (to) from consolidated affiliates	(58,278,000)	(48,823,000)
Net cash (used in) provided by financing activities	(144,034,000)	(23,247,000)
Net decrease and cash equivalents	(9,363,000)	(162,390,000)
Net effect of currency translation on cash	20,000	0
Cash and cash equivalents - beginning of period	16,241,000	177,223,000
Cash and cash equivalents - end of period	6,898,000	14,833,000
Cash and cash equivalents of discontinued operations	684,000	9,071,000
Cash and cash equivalents of continuing operations	6,214,000	5,762,000
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	19,223,000	(14,107,000)
Cash flows provided by (used in) investing activities:
Cash paid for acquisitions, net, including contingent consideration	(1,402,000)	(9,444,000)
Capital expenditures	(1,222,000)	(36,000)
Proceeds from sale of assets	0	0
Proceeds from disposal of business, net	0
Proceeds from redemption of investments		0
Investments in life insurance policies	0	0
Net cash provided by (used in) investing activities	(2,624,000)	(9,480,000)
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 (repayments of) book overdrafts	0	0
Payments of capital lease obligations	(16,000)	(29,000)
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	(16,452,000)	24,839,000
Net cash (used in) provided by financing activities	(16,468,000)	24,810,000
Net decrease and cash equivalents	131,000	1,223,000
Net effect of currency translation on cash	115,000	(74,000)
Cash and cash equivalents - beginning of period	4,038,000	381,000
Cash and cash equivalents - end of period	4,284,000	1,530,000
Cash and cash equivalents of discontinued operations	26,000	8,000
Cash and cash equivalents of continuing operations	4,258,000	1,522,000
Consolidation, Eliminations [Member]
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 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 (repayments of) 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 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