Goodwill and Intangibles - Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 156,945	$ 149,424
Accumulated Amortization	(76,637)	(67,115)
Net Carrying Amount	80,308	82,309
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	137,227	133,471
Accumulated Amortization	(64,901)	(59,773)
Net Carrying Amount	72,326	73,698
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,941	9,252
Accumulated Amortization	(7,186)	(6,842)
Net Carrying Amount	1,755	2,410
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,777	6,701
Accumulated Amortization	(4,550)	(500)
Net Carrying Amount	$ 6,227	$ 6,201