Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail)

v3.7.0.1
Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 725,164  
Other comprehensive income (loss) before reclassifications     (38)  
Amounts reclassified out of accumulated other comprehensive income (loss)     1,367  
Other comprehensive income (loss) $ 26 $ (1,735) 1,329 $ (4,760)
Ending Balance 713,410   713,410  
Gains and Losses on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (2,085)  
Other comprehensive income (loss) before reclassifications     (38)  
Amounts reclassified out of accumulated other comprehensive income (loss)     1,367  
Other comprehensive income (loss)     1,329  
Ending Balance (756)   (756)  
Defined Benefit Pension Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (177)  
Ending Balance (177)   (177)  
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (2,262)  
Ending Balance $ (933)   $ (933)