Allowance for Doubtful Accounts - Summary of Allowance for Doubtful Accounts (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Summary Of Allowance For Doubtful Accounts [Abstract]
Balance at December 31, 2014	$ 3,942
Provision charged to income	1,075
Write-offs	(967)
Currency	(81)
Balance at June 30, 2015	$ 3,969