Segment Reporting, Geographic and Customer Information - Geographic Information by Organizational Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenue:
REVENUE	$ 571,407	$ 574,448	$ 1,724,583	$ 1,711,829
Long-Lived Assets:
Long-Lived Assets	2,756,169		2,756,169		$ 2,812,045
Americas-United States [Member]
Revenue:
REVENUE	462,281	458,705	1,374,041	1,360,574
Long-Lived Assets:
Long-Lived Assets	2,548,526		2,548,526		2,593,739
Europe, Middle East & Africa (EMEA) [Member]
Revenue:
REVENUE	67,333	75,564	228,158	230,791
Long-Lived Assets:
Long-Lived Assets	179,122		179,122		195,203
Asia Pacific [Member]
Revenue:
REVENUE	37,153	36,387	108,282	108,698
Long-Lived Assets:
Long-Lived Assets	19,329		19,329		21,151
Americas-Other [Member]
Revenue:
REVENUE	4,640	$ 3,792	14,102	$ 11,766
Long-Lived Assets:
Long-Lived Assets	$ 9,192		$ 9,192		$ 1,952