Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Equity Attributable to Non-controlling Interests (Detail)

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Stockholders' Equity - Equity Attributable to Non-controlling Interests (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Noncontrolling Interest [Abstract]        
Non-controlling interests, beginning of period     $ 119,147 $ 81,881
Net earnings $ 15,323 $ 14,520 50,504 41,025
Foreign currency translation adjustment     (8,120) 3,288
Capital contributions       46
Capital distributions     (18,663) (9,347)
Non-controlling interests, end of period $ 142,868 $ 116,893 $ 142,868 $ 116,893