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Reconciliation of Beginning and Ending Liability for Unrecognized Tax Benefits that Do Not Meet More-Likely-than-not Threshold (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Balance beginning $ 31,877 $ 60,538
Additions for tax positions related to current year 6,131 914
Additions (reductions) for tax positions related to prior years 2,999 (27,312)
Reductions related to lapse of applicable statute (1,996) (2,077)
Reductions related to settlements with taxing authorities   (186)
Balance ending $ 39,011 $ 31,877