Acquisition of Alpine Access, Inc - Additional Information (Detail) (USD $)							0 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Americas [Member]	Dec. 31, 2012 Americas [Member]	Dec. 31, 2011 Americas [Member]	Aug. 20, 2012 Alpine Access, Inc [Member] Americas [Member]	Dec. 31, 2012 Alpine Access, Inc [Member] Americas [Member]	Dec. 31, 2013 Alpine Access, Inc [Member] Americas [Member]
Business Acquisition [Line Items]
Percentage of common shares and voting rights acquired							100.00%
Business acquisition date									Aug. 20, 2012
Fair value of the consideration transferred							$ 148,953,000
Consideration by cash							41,000,000
Proceeds from draw down under credit agreement							108,000,000
Goodwill	199,802,000	204,231,000	121,342,000	199,802,000	204,231,000	121,342,000	80,766,000
Fair value of receivables purchased							11,831,000
Gross contractual amount							11,800,000
(Loss) from continuing operations before income taxes								(3,201,000)
Severance-related costs, depreciation and amortization								$ 3,600,000