Acquisition of Alpine Access, Inc - Revenues and Earnings of Acquired Entity Since Acquisition Date (Detail) (Alpine Access, Inc [Member], Americas [Member], USD $) In Thousands, unless otherwise specified	4 Months Ended
	Dec. 31, 2012
Alpine Access, Inc [Member] | Americas [Member]
Business Acquisition [Line Items]
Revenues	$ 40,635
(Loss) from continuing operations before income taxes	(3,201)
(Loss) from continuing operations, net of taxes	$ (2,166)