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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, beginning balance $ 6,559,000 $ 11,851,000 $ 7,064,000
Additions based on tax positions related to the current year 1,120,000 638,000 4,853,000
Additions for tax positions of prior years 132,000 121,000 545,000
Reductions for tax positions of prior years (255,000) (3,691,000) (538,000)
Settlement of tax audits 0 (258,000) 0
Reductions due to lapsed statute of limitations (466,000) (2,102,000) (73,000)
Unrecognized tax benefits, ending balance 7,090,000 $ 6,559,000 $ 11,851,000
Tax benefits associated with potential transfer pricing adjustments $ 1,368,000