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Prior Periods Financial Statement Revision - Schedule of Revision on Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Changes And Error Corrections [Line Items]          
Total current assets $ 552,435   $ 281,427 [1]    
Property, plant and equipment, net 238,809   230,580 [1]    
Goodwill, net 443,496   441,402 [1]    
Investment in joint venture 37,739   36,008 [1]    
Total assets 1,517,510   1,356,572 [1]    
Accrued salaries, wages and benefits 17,362   15,762 [1]    
Income taxes payable 65,989        
Total current liabilities 175,004   139,488 [1]    
Non-current deferred tax liabilities 96,316   96,069 [1]    
Other liabilities 10,887   12,829 [1]    
Total liabilities 1,076,206   1,046,059 [1]    
Additional paid-in capital       $ 277,917  
Accumulated other comprehensive income (loss)   $ (24,804) (29,808) (21,992) $ 4,657
Total stockholders' equity 441,304 323,491 310,513 [1],[2] 312,020 172,989
Total liabilities and stockholders' equity $ 1,517,510   1,356,572 [1]    
As Previously Reported [Member]          
Accounting Changes And Error Corrections [Line Items]          
Current deferred tax assets       6,696  
Total current assets       280,181  
Property, plant and equipment, net       318,968  
Goodwill, net       449,898  
Investment in joint venture   42,387 40,694 38,462  
Total assets   1,391,043 1,360,386 1,380,567  
Accrued salaries, wages and benefits       21,125  
Income taxes payable       5,350  
Total current liabilities       133,351  
Non-current deferred tax liabilities       117,459  
Other liabilities       4,746  
Total liabilities       1,066,686  
Additional paid-in capital       277,582  
Retained earnings       55,151  
Accumulated other comprehensive income (loss)   (20,416) (25,122) (19,153) 5,367
Total stockholders' equity   327,879 315,199 313,881 173,699
Total liabilities and stockholders' equity   1,391,043 1,360,386 1,380,567  
Adjustment [Member]          
Accounting Changes And Error Corrections [Line Items]          
Current deferred tax assets       3,707  
Total current assets       3,707  
Property, plant and equipment, net       (329)  
Goodwill, net       5,072  
Investment in joint venture   (4,388) (4,686) (2,212)  
Total assets   (4,388) (4,686) 6,238  
Accrued salaries, wages and benefits       (300)  
Income taxes payable       44  
Total current liabilities       (256)  
Non-current deferred tax liabilities       8,176  
Other liabilities       178  
Total liabilities       8,098  
Additional paid-in capital       335  
Retained earnings       643  
Accumulated other comprehensive income (loss)   (4,388) (4,686) (2,839) (710)
Total stockholders' equity   (4,388) (4,686) (1,861) $ (710)
Total liabilities and stockholders' equity   (4,388) (4,686) 6,238  
As Revised [Member]          
Accounting Changes And Error Corrections [Line Items]          
Current deferred tax assets       10,403  
Total current assets       283,888  
Property, plant and equipment, net       318,639  
Goodwill, net       454,970  
Investment in joint venture   37,999 36,008 36,250  
Total assets   1,386,655 1,355,700 1,386,805  
Accrued salaries, wages and benefits       20,825  
Income taxes payable       5,394  
Total current liabilities       133,095  
Non-current deferred tax liabilities       125,635  
Other liabilities       4,924  
Total liabilities       1,074,784  
Additional paid-in capital       277,917  
Retained earnings       55,794  
Accumulated other comprehensive income (loss)   (24,804) (29,808) (21,992)  
Total stockholders' equity   323,491 310,513 312,020  
Total liabilities and stockholders' equity   $ 1,386,655 $ 1,355,700 $ 1,386,805  
[1] Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)
[2] Includes the effects of prior periods' revisions (Note 1 and Note 15)