Schedule of Amortizable Intangible Asset (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 102,337	$ 100,394
Accumulated Amortization	(54,457)	(43,820)
Net book value	47,880	56,574
Customer related intangibles
Finite-Lived Intangible Assets [Line Items]
Cost	48,634	48,634
Accumulated Amortization	(22,813)	(18,317)
Net book value	25,821	30,317
Customer related intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	4 years	4 years
Customer related intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	9 years	9 years
Technology
Finite-Lived Intangible Assets [Line Items]
Cost	48,342	47,102
Accumulated Amortization	(27,539)	(22,873)
Net book value	20,803	24,229
Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	3 years	3 years
Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	9 years	9 years
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Cost	5,361	4,658
Accumulated Amortization	(4,105)	(2,630)
Net book value	$ 1,256	$ 2,028
Other intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	1 year	1 year
Other intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Useful Lives	5 years	5 years