Segment Reporting - Additional Information (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Revenue, Major Customer [Line Items]
Total consolidated revenue from customer	$ 228,250,000	[1]	$ 202,501,000	[1]	$ 447,773,000	[1]	$ 391,607,000	[1]
American Express Corp.
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%				10.00%
Total consolidated revenue from customer	49,300,000		52,700,000		96,200,000		104,600,000
Percent of total consolidated revenues from customer	21.60%		26.00%		21.50%		26.70%
Accounts receivable from customer	16,500,000				16,500,000				20,400,000
State Street Bank
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%				10.00%
Total consolidated revenue from customer	32,100,000		32,100,000		63,700,000		63,500,000
Percent of total consolidated revenues from customer	14.10%		15.90%		14.20%		16.20%
Accounts receivable from customer	13,300,000				13,300,000				10,600,000
Federal Express Corp.
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%				10.00%
Total consolidated revenue from customer	26,200,000		14,700,000		50,900,000		24,400,000
Percent of total consolidated revenues from customer	11.50%		7.20%		11.40%		6.20%
Accounts receivable from customer	$ 9,100,000				$ 9,100,000				$ 12,300,000

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