Income Tax - Segregation of Income Tax Expense (Benefit) Based on Location of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income before income tax provision
Income before income tax provision	$ 60,199	$ 83,397	$ 82,042
Current tax provision (benefit)
Current tax provision (benefit), Puerto Rico	1,892	7,072	(3,500)
Current tax provision (benefit), United States	292	567	413
Current tax provision (benefit), Foreign countries	6,902	5,226	2,842
Total current tax provision (benefit)	9,086	12,865	(245)
Deferred tax benefit
Deferred tax benefit, Puerto Rico	(3,176)	(2,874)	(2,169)
Deferred tax benefit, United States	(184)	(259)	(114)
Deferred tax benefit, Foreign countries	(946)	(1,461)	(807)
Total deferred tax benefit	(4,306)	(4,594)	(3,090)
Puerto Rico
Income before income tax provision
Income before income tax provision	47,347	70,899	73,327
United States
Income before income tax provision
Income before income tax provision	3,089	2,670	1,879
Foreign countries
Income before income tax provision
Income before income tax provision	$ 9,763	$ 9,828	$ 6,836