Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Taxes [Line Items]
Income tax expense (benefit)	$ 0.8	$ 0.7
U.S. Federal NOLs
Income Taxes [Line Items]
Net operating loss carry forwards			$ 916.0
Net operating loss expiration period			20 years
Net operating loss carry forwards expiration year			Dec. 31, 2027
Non-U.S. NOLs
Income Taxes [Line Items]
Net operating loss carry forwards			$ 30.4