Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclsoure [Line Items]
Additional federal tax	$ 3,800
Foreign loss carryforwards	12,600
Decrease in current taxes payable	700
Deferred tax asset net of valuation allowance	56,072	$ 50,244
Income taxes receivable	3,600	3,800
Current income taxes payable	$ 19,000	$ 10,000
U.S. statutory tax rate	35.00%	35.00%	35.00%
Foreign Tax Authority
Income Tax Disclsoure [Line Items]
Tax credit carryforward	$ 300
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC)
Income Tax Disclsoure [Line Items]
Deferred tax asset net of valuation allowance	$ 2,400