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	$ 2,022,131
One to Two Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	1,865,173
Two to Three Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	1,639,401
Three to Four Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	1,324,178
Four to Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	1,835,230
Over Five Years [Member]
Disclosure Of Defined Benefit Plans [Line Items]
Estimate of contributions expected to be paid to plan	$ 6,834,655