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Summary of Significant Accounting Policies - Schedule of Cumulative Effect of Changes made to Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other receivables $ 28,163   $ 26,578
Deferred tax assets, net 35,615   23,428
Retained earnings 897,586   $ 922,178
ASU 2014-09 [member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other receivables   $ 26,952  
Deferred tax assets, net   23,332  
Retained earnings   922,456  
ASU 2014-09 [member] | Adjustments Due to ASU 2014-09 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other receivables (1) 374  
Deferred tax assets, net   (96)  
Retained earnings $ 110 $ 278