Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 303,751	$ 302,654
Accumulated Amortization	(71,698)	(64,961)
Net Balance	232,053	237,693
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	280,295	277,356
Accumulated Amortization	(55,152)	(49,410)
Net Balance	225,143	227,946
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,138	13,995
Accumulated Amortization	(5,333)	(4,383)
Net Balance	6,805	9,612
Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	438	438
Accumulated Amortization	(333)	(303)
Net Balance	105	135
Purchased contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,880	10,865
Accumulated Amortization	(10,880)	(10,865)
Net Balance