Employee Benefit Obligations - Summary of Expected Flow for Benefits for Next Five Years (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 CLP ($)
Less Than One Year [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	$ 6,004,886
One to Two Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	5,304,228
Two to Three Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	5,264,382
Three to Four Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	4,304,571
Four to Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	5,181,657
More Than Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	$ 23,620,901