Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Beginning balance	$ 17,384	$ 27,522	$ 16,363
Reductions	0	0	0
Reductions	0	(11,110)	(742)
Settlements	0	0	0
Lapses in statute of limitations	0	0	0
Ending balance	18,413	17,384	27,522
Federal [Member]
Income Tax Contingency [Line Items]
Tax positions related to current year, Additions	530	529	502
Tax positions related to prior year, Additions	0	0	0
State [Member]
Income Tax Contingency [Line Items]
Tax positions related to current year, Additions	499	443	6,141
Tax positions related to prior year, Additions	0	0	5,258
Foreign [Member]
Income Tax Contingency [Line Items]
Tax positions related to prior year, Additions	$ 0	$ 0	$ 0