Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets by Major Class [Line Items]
Definite-lived intangibles, gross amount	$ 82,065	$ 54,180
Intangibles, gross amount	114,205	86,320
Definite-lived intangibles, accumulated amortization	(17,763)	(14,266)
Intangibles, accumulated amortization	(17,763)	(14,266)
Trade names
Intangible Assets by Major Class [Line Items]
Indefinite-lived intangibles, gross amount	32,140	32,140
Customer relationships
Intangible Assets by Major Class [Line Items]
Definite-lived intangibles, gross amount	68,939	42,528
Definite-lived intangibles, accumulated amortization	(8,315)	(5,205)
Other definite-lived intangibles
Intangible Assets by Major Class [Line Items]
Definite-lived intangibles, gross amount	13,126	11,652
Definite-lived intangibles, accumulated amortization	$ (9,448)	$ (9,061)