Consolidated Total Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 3,391,554	$ 3,376,293
Cash and cash equivalents	87,632	104,522	$ 127,167	$ 185,488
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,303,922	3,271,771
Operating Segments | Global Solutions
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,900,618	2,870,999
Operating Segments | Global Products
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	403,304	400,772
Segment Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 87,632	$ 104,522