Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes Disclosure [Line Items]
Change in state and local income taxes (as a percent)	(6.00%)
Effective income tax rate	41.20%	47.20%	53.20%
Tax rate change (as a percent)	$ (528)	$ 3,130	$ 2,594
State tax return to provision adjustment	$ (1,267)	$ 0	$ 0
State tax return to provision adjustment (as a percent)	(1.20%)	0.00%	0.00%
Valuation allowance related to operating loss carryforwards	$ 400
Valuation allowance	5,689	$ 5,276
Current tax expense (benefit)	1,274	13,361	$ (26,263)
Valuation allowance related to tax credit carryforwards	4,700	4,700
Employment tax credit disallowed	1,228	1,340	1,202
Unrecognized tax benefits	750	2,618	$ 2,471	$ 2,300
Unrecognized tax benefits, income tax penalties and interest accrued	800	800
Canadian Subsidiary
Income Taxes Disclosure [Line Items]
Undistributed earnings	2,700
Stock Option Exercises And Net Operating Loss Carryforward
Income Taxes Disclosure [Line Items]
Current tax expense (benefit)	(4,700)
State and Local Jurisdiction
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards	95,500
Tax credit carryforwards	6,500
State and Local Jurisdiction | Net Operating Loss Carryforwards
Income Taxes Disclosure [Line Items]
Stock option excess tax benefits	13,100
Uncertain Tax Positions
Income Taxes Disclosure [Line Items]
Unrecognized tax benefits	600	$ 3,300
Internal Revenue Service (IRS)
Income Taxes Disclosure [Line Items]
Employment tax credit disallowed	10,500
Income tax examination, penalties and interest expense	$ 4,000