Leases - Schedule of Future Minimum Rental Payments Under Non-Cancelable Capital Leases and Operating Leases (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Minimum [Member]
Operating Leases Future Minimum Payments Due [Line Items]
Capital leases interest rate	3.80%
Maximum [Member]
Operating Leases Future Minimum Payments Due [Line Items]
Capital leases interest rate	4.00%