SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Total Revenues Based on Location of the Customer and Long-Lived Assets by Geographic Regions (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 3,210,853	$ 3,419,253	$ 3,545,088	$ 3,300,890	$ 3,357,202	$ 3,467,362	$ 3,502,918	$ 3,142,585	$ 13,476,084	$ 13,470,067	$ 12,752,076
Total long-lived assets	345,323				283,841				345,323	283,841	309,260
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues									12,097,633	11,800,140	11,140,163
Total long-lived assets	320,445				257,587				320,445	257,587	284,693
Other Locations
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues									1,378,451	1,669,927	1,611,913
Total long-lived assets	$ 24,878				$ 26,254				$ 24,878	$ 26,254	$ 24,567