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
Mar. 31, 2018
Mar. 31, 2017
Noncontrolling Interest [Abstract]    
Non-controlling interests, beginning of period $ 119,147 $ 81,881
Net earnings 19,606 12,640
Foreign currency translation adjustment 2,839 1,683
Capital contributions   46
Capital distributions (4,437) (892)
Non-controlling interests, end of period $ 137,155 $ 95,358