Segment Reporting, Geographic and Customer Information - Geographic Information by Organizational Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenue:
REVENUE	$ 582,397	$ 571,891	$ 1,153,176	$ 1,137,381
Long-Lived Assets:
Long-Lived Assets	2,780,388		2,780,388		$ 2,812,045
Americas-United States [Member]
Revenue:
REVENUE	459,330	454,656	911,760	901,869
Long-Lived Assets:
Long-Lived Assets	2,567,467		2,567,467		2,593,739
Europe, Middle East & Africa (EMEA) [Member]
Revenue:
REVENUE	81,430	77,250	160,825	155,227
Long-Lived Assets:
Long-Lived Assets	185,955		185,955		195,203
Asia Pacific [Member]
Revenue:
REVENUE	36,473	37,800	71,129	72,311
Long-Lived Assets:
Long-Lived Assets	19,697		19,697		21,151
Americas-Other [Member]
Revenue:
REVENUE	5,164	$ 2,185	9,462	$ 7,974
Long-Lived Assets:
Long-Lived Assets	$ 7,269		$ 7,269		$ 1,952