Segment Reporting - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer	$ 237,887	$ 241,255	$ 246,018	$ 241,390	$ 254,580	$ 253,636	$ 239,797	$ 220,599	$ 966,550	[1]	$ 968,612	[1]	$ 911,429	[1]
American Express Corp.
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer									$ 210,100		$ 204,000		$ 201,600
Percent of total consolidated revenues from customer									22.00%		21.00%		22.00%
Accounts receivable from customer	24,300				31,800				$ 24,300		$ 31,800		$ 19,000
State Street Bank
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer									$ 134,300		$ 140,600		$ 126,400
Percent of total consolidated revenues from customer									14.00%		15.00%		14.00%
Accounts receivable from customer	10,900				16,600				$ 10,900		$ 16,600		$ 11,300
Federal Express Corporation
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer									$ 119,900		$ 120,100		$ 105,000
Percent of total consolidated revenues from customer									12.00%		12.00%		12.00%
Accounts receivable from customer	$ 17,800				$ 12,200				$ 17,800		$ 12,200		$ 14,300
Sales Revenue, Net | Customer Concentration Risk | American Express Corp.
Revenue, Major Customer [Line Items]
Concentration of sales by customer									10.00%		10.00%		10.00%
Sales Revenue, Net | Customer Concentration Risk | State Street Bank
Revenue, Major Customer [Line Items]
Concentration of sales by customer									10.00%		10.00%		10.00%
Sales Revenue, Net | Customer Concentration Risk | Federal Express Corporation
Revenue, Major Customer [Line Items]
Concentration of sales by customer									10.00%		10.00%		10.00%

[1] Net revenues are attributed to regions based upon customer location.