Schedule of Unaudited Proforma Results of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
	Jan. 02, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition fees and expenses		$ 974	$ 21,526	$ 23,931
Shares issued to fund acquisition	31.6
Proforma results adjusted to exclude
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition fees and expenses		$ 700	$ 11,300