Segment Reporting - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue by geographic area
Total revenue	$ 37,450	$ 36,336	$ 32,768	$ 58,882	$ 39,370	$ 59,952	$ 22,661	$ 108,801	$ 165,436	$ 230,784	$ 200,707
United States [Member] | Reportable Geographical Components [Member]
Revenue by geographic area
Total revenue									39,147	40,400	32,514
European [Member] | Reportable Geographical Components [Member]
Revenue by geographic area
Total revenue									$ 126,289	$ 190,384	$ 168,193