Long Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 38,281	$ 31,319
Long-lived assets percentage	100.00%	100.00%
U.S.
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 27,993	$ 17,600
Long-lived assets percentage	73.00%	56.00%
India
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 7,158	$ 10,530
Long-lived assets percentage	19.00%	34.00%
International, other
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 3,130	$ 3,189
Long-lived assets percentage	8.00%	10.00%