Summary of Significant Accounting Policies - Summary of Non-current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Derivative instruments	$ 1,132	$ 576
Unrecognized tax benefits	3,066	2,878
Deferred rent	6,515	5,977
Retirement benefits	1,441	1,544
Other non-current liabilities	5,501	1,895
Non-current liabilities	$ 17,655	$ 12,870