Long-Lived Asset Impairment Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ 591	$ 273
U.S. Operating Segment
Impaired Long-Lived Assets Held and Used [Line Items]
Theatre properties	$ 591	$ 273