Acquisition (Details) - USD ($)					9 Months Ended	12 Months Ended
	Feb. 19, 2016	Sep. 21, 2015	Apr. 30, 2015	Oct. 02, 2012	Sep. 30, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2014
Business Acquisition [Line Items]
Interest acquired (as a percent)									30.00%
Expense of net debt working capital disallowed						$ 1,600,000
Expense disallowed under net debt working capital, net of tax						900,000
Acquisition and integration related costs included in depreciation and amortization expense						34,100,000	$ 30,400,000	$ 29,500,000
Central Merger
Business Acquisition [Line Items]
Interest acquired (as a percent)				100.00%
Common stock issued (in shares)				6,161,332
Assumption of debt, net of cash acquired				$ 217,700,000
Cash consideration payable in three years from the acquisition date, pursuant to the Merger Agreement and prior to Central Net Debt Working Capital				27,000,000	$ 27,000,000
Maximum Net Debt Working Capital Threshold				$ 275,000,000
Period after which contingent cash consideration to be paid				3 years
Threshold of Net Debt Working Capital, pursuant to the Merger Agreement					$ (285,000,000)
Price of share at which former stockholders of acquiree can elect to pay applicable amount (in dollars per share)					$ 23.64
Minimum cash consideration to cover capped indemnities (greater than)					$ 17,000,000
Net Debt Working Capital as defined in the Merger Agreement					(296,300,000)
Estimated amount for structural and repair cost with respect to indemnification claims						$ 1,200,000
Percentage of indemnification of cost pursuant to merger agreement						80.00%
Total amount before estimation of additional indemnification claims						$ 1,500,000
Net debt working capital above the upper threshold amount						6,600,000
Expense of net debt working capital disallowed						1,600,000
Expense disallowed under net debt working capital, net of tax						900,000
Amount in excess of upper threshold					11,300,000
Business Combination, Contingent Consideration, Indemnity Claims					23,400,000
Payment for adverse consequences not limited to structural and repair cost						18,800,000
Acquisition and integration related costs included in general and administrative expenses						6,200,000	8,500,000	10,900,000
Acquisition and integration related costs included in depreciation and amortization expense						1,000,000	$ 0	$ 0
General and administrative expense recognized						$ 1,600,000
April 30, 2015 | Central Merger
Business Acquisition [Line Items]
Net Debt Working Capital as defined in the Merger Agreement					(270,800,000)
Net debt working capital below lower threshold			$ 4,200,000
September 21, 2015 | Central Merger
Business Acquisition [Line Items]
Net Debt Working Capital as defined in the Merger Agreement					(278,000,000)
Net debt working capital above lower threshold		$ 3,000,000
October 1, 2015 | Central Merger
Business Acquisition [Line Items]
Net Debt Working Capital as defined in the Merger Agreement					(11,300,000)
February 19, 2016 | Central Merger
Business Acquisition [Line Items]
Net Debt Working Capital as defined in the Merger Agreement					(291,600,000)
Amount in excess of upper threshold					$ 6,600,000
Subsequent Event | Central Merger
Business Acquisition [Line Items]
Indemnification claims for Net Debt Working Capital and certain defined adverse consequences not recognized due to the contingent nature of these claims	$ 1,500,000
Business Combination, Contingent Consideration, Indemnity Claims	24,900,000
Net Debt Working Capital Allowable Claims	1,500,000
Additional amount disallowed determined by independent public accounting firm	1,600,000
Additional indemnification claims with respect to structural and repair costs	$ 6,100,000