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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Noncontrolling Interest [Abstract]        
Non-controlling interests, beginning of period     $ 119,147 $ 81,881
Net earnings $ 15,575 $ 13,865 35,181 26,505
Foreign currency translation adjustment     (4,284) 2,482
Capital contributions       46
Capital distributions     (7,666) (6,753)
Non-controlling interests, end of period $ 142,378 $ 104,161 $ 142,378 $ 104,161