Pre-Tax Book Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pre-tax Income (Loss) [Line Items]
Income (loss) before income taxes	$ (326,001)	$ (284,274)	$ 167,110
Domestic
Pre-tax Income (Loss) [Line Items]
Income (loss) before income taxes	(245,055)	(300,534)	118,060
Foreign
Pre-tax Income (Loss) [Line Items]
Income (loss) before income taxes	$ (80,946)	$ 16,260	$ 49,050