Segment Reporting - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer	[1]	$ 241,390	$ 220,599
American Express Corp.
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer		$ 55,300	$ 44,100
Percent of total consolidated revenues from customer		22.90%	20.00%
Accounts receivable from customer		$ 23,400		$ 31,800
State Street Bank
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer		$ 33,900	$ 31,600
Percent of total consolidated revenues from customer		14.00%	14.30%
Accounts receivable from customer		$ 9,900		16,600
Federal Express Corp.
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer		$ 28,800	$ 29,300
Percent of total consolidated revenues from customer		11.90%	13.30%
Accounts receivable from customer		$ 8,900		$ 12,200
Sales Revenue, Net | Customer Concentration Risk | American Express Corp.
Revenue, Major Customer [Line Items]
Concentration of sales by customer		10.00%
Sales Revenue, Net | Customer Concentration Risk | State Street Bank
Revenue, Major Customer [Line Items]
Concentration of sales by customer		10.00%
Sales Revenue, Net | Customer Concentration Risk | Federal Express Corp.
Revenue, Major Customer [Line Items]
Concentration of sales by customer		10.00%

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