Segment Information - Schedule of Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues									$ 1,866,131	$ 1,562,662	$ 1,436,849
Income before income taxes	$ 34,678	$ 32,930	$ 33,078	$ 32,279	$ 30,529	$ 30,571	$ 29,683	$ 29,604	132,965	120,387	89,764
Depreciation and amortization									8,886	7,496	7,660
Total assets	676,003				528,446				676,003	528,446	480,949
Capital expenditures									5,397	5,442	4,998
Customer Concentration Risk | Services
Segment Reporting Information [Line Items]
Revenues									327,500
Operating Segments | Housekeeping services
Segment Reporting Information [Line Items]
Revenues									979,610	957,148	909,709
Income before income taxes									95,505	90,756	84,471
Depreciation and amortization									6,547	6,535	6,488
Total assets	304,303				266,464				304,303	266,464	228,116
Capital expenditures									4,287	4,612	3,586
Operating Segments | Dietary services
Segment Reporting Information [Line Items]
Revenues									886,521	605,514	527,140
Income before income taxes									46,008	34,641	31,612
Depreciation and amortization									1,813	439	685
Total assets	242,874				127,187				242,874	127,187	104,797
Capital expenditures									663	410	336
Corporate and eliminations
Segment Reporting Information [Line Items]
Revenues									0	0	0
Income before income taxes									(8,548)	(5,010)	(26,319)
Depreciation and amortization									526	522	487
Total assets	$ 128,826				$ 134,795				128,826	134,795	148,036
Capital expenditures									$ 447	$ 420	$ 1,076