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Other Long-Term Obligations (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]    
Long-term lease obligations, net of current portion $ 23,850 $ 24,054
Deferred proceeds 8,811 9,386
Deferred compensation 8,939 10,755
Other 2,179 2,543
Other long-term obligations $ 43,779 $ 46,738