Receivables - Estimated Accretable Yield (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Beginning of period	$ 839	$ 8,908
Change in accretable yield due to change in timing of estimated cash flows	30	(166)
Interest income recognized	(869)	(7,903)
End of period	$ 0	$ 839