Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 302,287	$ 302,654
Accumulated Amortization	(77,782)	(64,961)
Net Balance	224,505	237,693
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	278,974	277,356
Accumulated Amortization	(60,352)	(49,410)
Net Balance	218,622	227,946
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,953	13,995
Accumulated Amortization	(6,145)	(4,383)
Net Balance	5,808	9,612
Purchased contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,920	10,865
Accumulated Amortization	(10,920)	(10,865)
Net Balance	0	0
Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	440	438
Accumulated Amortization	(365)	(303)
Net Balance	$ 75	$ 135