XML 74 R60.htm IDEA: XBRL DOCUMENT v3.7.0.1
Leases - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 31, 2016
Leases [Line Items]        
Rental expense $ 2,100,000 $ 3,400,000 $ 3,800,000  
Future minimum rental commitments, 2017 1,700,000      
Future minimum rental commitments, 2018 1,600,000      
Future minimum rental commitments, 2019 1,400,000      
Future minimum rental commitments, 2020 1,300,000      
Future minimum rental commitments, 2021 1,300,000      
Future minimum rental commitments, Thereafter $ 8,300,000      
Charges related to lease termination       $ 1,000,000
Lease termination Period 2016-07      
Future lease obligations $ 0      
Sublease rentals to be received 4,600,000      
Maximum [Member]        
Leases [Line Items]        
Future minimum rental commitments for capital leases, 2017 100,000      
Future minimum rental commitments for capital leases, 2018 100,000      
Future minimum rental commitments for capital leases, 2019 100,000      
Future minimum rental commitments for capital leases, 2020 100,000      
Future minimum rental commitments for capital leases, 2021 100,000      
Imputed interest maximum amount, 2017 100,000      
Imputed interest maximum amount, 2018 100,000      
Imputed interest maximum amount, 2019 100,000      
Imputed interest maximum amount, 2020 100,000      
Imputed interest maximum amount, 2021 $ 100,000