Noncontrolling Interests - Carrying Amount of Equity Attributable to Noncontrolling Interest (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 417,663	$ 374,619
Capital contributions	0	15,728
Dividends paid	0	(16,128)
Net earnings (loss) attributable to RNCI	18,541	(8,797)
Accumulated other comprehensive earnings (loss) attributable to RNCI	1,649	(745)
Transfer from noncontrolling interest	0	15,801
Accretion of RNCI to redemption value	1,803	37,185
Balance at end of period	$ 439,656	$ 417,663