Taxation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax Benefit from Stock Options Exercised	$ 67	$ 0	$ 77
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	4,922	7,936
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	3	162
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	65	42	667
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	6,665
Deferred Tax Assets, Valuation Allowance	1,833	1,868	1,327	1,102
Fully Vested Options Expired Unexercised
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	121	57
Restricted Stock
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	$ 3,255	$ 101