Acquisition of Alpine Access, Inc - Merger and Integration Costs (Detail) (Alpine Access, Inc [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Transaction and integration costs:
Total merger and integration costs	$ 2,114	$ 4,761
Direct Salaries and Related Costs [Member]
Severance costs:
Severance costs	526
General and Administrative [Member]
Severance costs:
Severance costs	1,144	968
Transaction and integration costs:
Transaction and integration costs	444	3,793
Americas [Member] | Direct Salaries and Related Costs [Member]
Severance costs:
Severance costs	526
Americas [Member] | General and Administrative [Member]
Severance costs:
Severance costs	985	591
Corporate [Member] | General and Administrative [Member]
Severance costs:
Severance costs	159	377
Transaction and integration costs:
Transaction and integration costs	$ 444	$ 3,793