Commitments and Contingent Liabilities - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010 USD ($)	Dec. 31, 2010 GBP (£)	Jun. 30, 2014 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Outstanding standby and commercial letters of credit			$ 18,655
Government grants awarded	1,325	850
Government grants received	1,083	680
Recorded liability			$ 0