Warranty Reserve and Accrual for Loss Contracts Related to Service - Loss Contracts Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Warranty Reserve and Accrual for Loss Contracts Related to Service
Beginning balance			$ 10,050
Provision	$ (1,100)	$ (10,100)	(1,071)	$ 10,050
Reduction for losses realized			(8,227)
Ending balance		$ 10,050	$ 752	$ 10,050