Asset Exchange - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 04, 2016	Dec. 31, 2016
Asset Exchange [Line Items]
Fair value of assets received in asset exchange		$ 2,794
Additional cash payments		$ 1,897
Assets held for exchange | International Broadcasting Corp
Asset Exchange [Line Items]
Fair value of assets received in asset exchange	$ 2,900
Additional cash payments	1,900
Assets held for exchange | International Broadcasting Corp | FCC Broadcasting License
Asset Exchange [Line Items]
Fair value difference of assets exchanged	$ 1,800