Noncontrolling Interests - Carrying Amount of Equity Attributable to Noncontrolling Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of year	$ 374,619	$ 100,859
Capital contributions	15,728	272,722
Dividends paid	(16,128)	0
Net earnings (loss) attributable to RNCI	(8,797)	4,059
Accumulated other comprehensive loss attributable to RNCI	(745)	(1,993)
Transfer from (to) noncontrolling interest	15,801	(1,028)
Accretion of RNCI to redemption value	37,185	0
Balance at end of year	$ 417,663	$ 374,619