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Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Jun. 30, 2011
Jun. 30, 2010
Income Tax Disclosure [Abstract]          
Tax computed at the federal statutory rate $ (1,907) $ 1,857 $ (12,234) $ 3,799 $ (10,005)
State taxes, net of federal benefit 82 122 329 250 (359)
Tax rate differential for international subsidiaries 1,589 [1] (23) [1] 10,743 [1] (47) [1] (13) [1]
Stock-based compensation 978 244 3,926 727 149
Tax credits (378) (150) (1,056) (409) (282)
Tax contingencies 178 74 452 171 265
Permanent differences 244 120 532 305 411
Change in state rate 8 295 (68) 662 (1,170)
Other 146 379 (697) 344 117
Valuation allowance 135 (2,265) (559) (4,466) 11,167
Provision for income taxes $ 1,075 $ 653 $ 1,368 $ 1,336 $ 280
[1] The change in the impact of the tax rate differential for international jurisdictions is primarily attributable to a change in the mix of income/loss from the United States to international jurisdictions with different income tax rates compared to the United States.