Goodwill and Intangibles - Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 152,126	$ 149,424
Accumulated Amortization	(78,012)	(67,115)
Net Carrying Amount	74,114	82,309
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	132,691	133,471
Accumulated Amortization	(66,050)	(59,773)
Net Carrying Amount	66,641	73,698
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,948	9,252
Accumulated Amortization	(7,475)	(6,842)
Net Carrying Amount	1,473	2,410
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,487	6,701
Accumulated Amortization	(4,487)	(500)
Net Carrying Amount	$ 6,000	$ 6,201