Subsequent Events - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares	Jul. 25, 2018 $ / shares	Jul. 23, 2018 USD ($)
Subsequent Event [Line Items]
Dividend payable, date declared	Jul. 25, 2018
Dividend payable, date of record	Oct. 01, 2018
Dividend payable, date to be paid	Oct. 19, 2018
Olapic Argentina S.A [Member]
Subsequent Event [Line Items]
Number of employees	93
Cumulative inflationary period	3 years
Cumulative inflation percentage	100.00%
Share Repurchase Program [Member]
Subsequent Event [Line Items]
Number of shares repurchased under stock repurchase program | shares	44,600
Total common stock aggregate purchase price	$ 900,000
Purchase of common stock, average price per share | $ / shares	$ 20.77
Minimum [Member] | Olapic Argentina S.A [Member]
Subsequent Event [Line Items]
Monthly operation average amount	$ 400,000
Maximum [Member] | Olapic Argentina S.A [Member]
Subsequent Event [Line Items]
Monthly operation average amount	$ 500,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend approved, amount per share | $ / shares		$ 0.116
Subsequent Event [Member] | Share Repurchase Program [Member]
Subsequent Event [Line Items]
Stock repurchase program, remaining repurchase amount			$ 23,100,000