Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.6.0.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]    
Net short-term deferred tax asset $ 0 $ 13,600
Net long-term deferred tax asset 2,400 2,800
Net short-term deferred tax liability 0 100
Net long-term deferred tax liability 76,447 73,322
Gross deferred tax assets related to state net operating loss carryforwards 294,500  
Valuation allowance related to certain state net operating loss carryforward deferred tax assets 7,200  
Liabilities recorded related to unrecognized tax benefits   5,800
Liabilities related to interest and penalties 900 1,100
Unrecognized tax benefit that would affect income tax rate if recognized $ 3,300 $ 2,600
State and Local Jurisdiction [Member]    
Income Taxes [Line Items]    
Operating loss expiration date Net operating loss carryforwards that will expire between 2017 and 2036  
Operating loss expiration, beginning year 2017  
Operating loss expiration, ending year 2036  
State and Local Jurisdiction [Member] | Tax Year 2016 [Member]    
Income Taxes [Line Items]    
Income tax examination year 2016  
State and Local Jurisdiction [Member] | Tax Year 2006 [Member]    
Income Taxes [Line Items]    
Income tax examination year 2006  
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2013 [Member]    
Income Taxes [Line Items]    
Income tax examination year 2013  
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2016 [Member]    
Income Taxes [Line Items]    
Income tax examination year 2016