Other Assets - Summary of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Debt issue costs, net	$ 4,478	$ 7,628
Equity investments	177,430	129,337
Other corporate assets	77,580	31,547
Prepaids and other assets	44,285	27,028
Total other assets	$ 303,773	$ 195,540