Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Depreciation expense for continuing operations	$ 24.8	$ 52.6	$ 61.1
Depreciation expense for discontinued operations	0.0	2.0	$ 10.7
Asset impairment charges	$ 41.7	$ 25.0