Reportable Segments - Summarized Financial Information Based Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net revenue
Total net revenue	$ 67,697	$ 59,694	$ 128,818	$ 117,268
Direct profit contribution
Total direct profit contribution	35,440	29,429	64,197	57,997
Adjustments:
Stock-based compensation	(688)	(715)	(1,420)	(1,287)
Other, net	(5,675)	(2,902)	(11,077)	(5,900)
Gross profit	29,077	25,812	51,700	50,810
NALA
Net revenue
Net revenue	42,482	36,961	80,289	73,073
Direct profit contribution
Direct profit contribution, Home Country	24,377	19,150	43,610	37,668
EMEA
Net revenue
Net revenue	18,238	15,518	35,758	31,266
Direct profit contribution
Direct profit contribution, Foreign Country	9,154	7,756	17,879	16,223
APJ
Net revenue
Net revenue	6,977	7,215	12,771	12,929
Direct profit contribution
Direct profit contribution, Foreign Country	$ 1,909	$ 2,523	$ 2,708	$ 4,106