Tax Effects of Temporary Differences that Give Rise to Deferred Tax Assets And Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Allowance for doubtful accounts	$ 941	$ 1,310
Accrued expenses and other liabilities	9,731	6,038
Tax loss carry-forwards	71,916	67,892
Tax credits	55,312	48,843
Non-cash stock based compensation expense	6,552	4,379
Valuation allowance	(69,807)	(48,906)
Deferred tax assets	74,645	79,556
Deferred tax liabilities:
Foreign investment	(12,166)	(9,606)
Property and equipment	(25,018)	(24,956)
Goodwill and intangibles	(11,199)	(60,941)
Deferred tax liabilities	(48,383)	(95,503)
Net deferred tax assets (liabilities)	$ 26,262	$ (15,947)