Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Earnings before Income Taxes (Detail)

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Income Taxes - Summary of Earnings before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Expected income tax expense $ 116,724 $ 66,981 $ 28,775
State income tax, net of federal benefit 2,011 1,032 255
Rate differential on foreign income (44,541) (27,364) (11,897)
Change in unrecognized tax benefits (2,233) (2,717) 740
Non-deductible expenses (350) 288 (150)
Prior year R&D credit claims     (493)
Other 285 3,333 (1,187)
Change in valuation allowance 554 (2,369) 5,304
Total income taxes (benefit) $ 72,450 $ 39,184 $ 21,347
Effective tax rate 21.70% 20.50% 26.00%