Condensed Consolidated Financial Statements - Additional Information (Detail) (USD $)	6 Months Ended		3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Cornastone Technology Investments (Proprietary) Limited	Dec. 31, 2013 Cornastone Technology Investments (Proprietary) Limited Other Noncurrent Liabilities
Summary Of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds	$ 208,600,000	$ 284,000,000
Accumulated other comprehensive loss	(14,096,000)	(23,315,000)
Payments for partnership dissolved	1,391,000		1,500,000
Noncontrolling interest				$ 1,100,000