Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expenses And Other Current Assets [Line Items]
Software licenses and maintenance contracts	$ 7,008	$ 8,302
Deferred project costs	3,223	3,113
Guarantee deposits	4,870	3,396
Insurance	1,244	1,272
Postage	3,068	296
Other	2,172	1,331
Prepaid expenses and other assets	25,011	20,430
Income Taxes
Prepaid Expenses And Other Current Assets [Line Items]
Prepaid income tax	1,875	1,362
Taxes other than Income
Prepaid Expenses And Other Current Assets [Line Items]
Prepaid income tax	$ 1,551	$ 1,358