Segments and Geographic Information - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 7,712,103	$ 4,917,058
Cash and cash equivalents	792,959	729,321	$ 481,049	$ 346,320
Funds restricted for acquisition	2,746,875
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	4,110,800	4,128,800
Operating Segments [Member] | Wireless [Member]
Segment Reporting Information [Line Items]
Total assets	2,385,700	2,372,800
Operating Segments [Member] | Enterprise [Member]
Segment Reporting Information [Line Items]
Total assets	1,390,600	1,403,400
Operating Segments [Member] | Broadband [Member]
Segment Reporting Information [Line Items]
Total assets	334,500	352,600
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	793,000	729,300
Deferred income tax assets	61,400	$ 59,000
Funds restricted for acquisition	$ 2,746,900