Business Combinations - Summary of Consideration Transferred and Identified Assets Acquired and Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Feb. 28, 2013 CSG	Aug. 08, 2013 DBT	Aug. 30, 2013 Multiband
Business Acquisition [Line Items]
Cash			$ 18,000	$ 1,306	$ 101,092
Contingent consideration			9,163	741
Total purchase price			27,163	2,047	101,092
Accounts receivable					28,035
Inventory					9,984
Deferred tax assets					1,665
Other current assets					9,367
Current assets			13,568	8
Non-current assets			541	157	27,279
Intangible assets			11,720		33,640
Goodwill	69,178	69,134	8,648	1,882	58,648
Total assets acquired			34,477	2,047	168,618
Current liabilities			7,276
Accounts payable					23,358
Accrued liabilities					22,902
Other current liabilities					5,291
Other non-current liabilities					15,975
Non-current liabilities			38
Total liabilities assumed			7,314		67,526
Net assets acquired			$ 27,163		$ 101,092