Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Impact of Early Adoption of ASU 2016-18 (Detail)

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Summary of Significant Accounting Policies - Impact of Early Adoption of ASU 2016-18 (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash used in investing activities $ (190,631) $ (349,046) $ (357,203)
Net cash provided by financing activities 113,704 339,601 340,511
(Decrease) increase in cash, cash equivalents and restricted cash (20,072) 9,074 (11,569)
Cash, cash equivalents, and restricted cash at beginning of period 79,216 70,142 81,711
Cash, cash equivalents, and restricted cash at end of period 59,144 79,216 70,142
Accounting Standards Update 2016-18 [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash used in investing activities   (349,046) (357,203)
Net cash provided by financing activities   339,601 340,511
(Decrease) increase in cash, cash equivalents and restricted cash   9,074 (11,569)
Cash, cash equivalents, and restricted cash at beginning of period 79,216 70,142 81,711
Cash, cash equivalents, and restricted cash at end of period   79,216 70,142
As Previously Reported [Member] | Accounting Standards Update 2016-18 [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash used in investing activities   (361,081) (319,281)
Net cash provided by financing activities   327,008 340,511
(Decrease) increase in cash, cash equivalents and restricted cash   (15,554) 26,353
Cash, cash equivalents, and restricted cash at beginning of period 42,645 58,199 31,846
Cash, cash equivalents, and restricted cash at end of period   42,645 58,199
Effect of Accounting Change [Member] | Accounting Standards Update 2016-18 [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Net cash used in investing activities   12,035 (37,922)
Net cash provided by financing activities   12,593  
(Decrease) increase in cash, cash equivalents and restricted cash   24,628 (37,922)
Cash, cash equivalents, and restricted cash at beginning of period $ 36,571 11,943 49,865
Cash, cash equivalents, and restricted cash at end of period   $ 36,571 $ 11,943