Other Long-Term Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]
Long-term lease obligations, net of current portion	$ 22,885	$ 23,152
Deferred proceeds	6,357	9,013
Deferred compensation	4,781	7,219
Other	6,753	2,392
Other long-term obligations	$ 40,776	$ 41,776