Goodwill and Intangibles - Intangible Assets and Accumulated Amortization Balances (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 153,261	$ 154,770
Accumulated Amortization	(64,948)	(53,334)
Net Carrying Amount	88,313	101,436
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	134,327	135,483
Accumulated Amortization	(56,888)	(46,466)
Net Carrying Amount	77,439	89,017
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,400	9,757
Accumulated Amortization	(6,645)	(5,817)
Net Carrying Amount	2,755	3,940
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,534	9,530
Accumulated Amortization	(1,415)	(1,051)
Net Carrying Amount	$ 8,119	$ 8,479